07/02/2024 (Wednesday) 02:00 am |
Dr. Markus Pesch
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Cutting-Edge Aerosol Measurement Technologies
Cutting-Edge Aerosol Measurement Technologies
Abstract
Accurate measurement of airborne aerosols particles remains a significant challenge. Unlike gaseous pollutants, aerosols exhibit diverse behaviors, including potential loss during sampling and alterations in size and quantity through processes like agglomeration, sedimentation, diffusion, or impaction. Moreover, depending on their origin and formation conditions, aerosols vary widely in size, spanning from approximately 1 nm to a maximum of around 100 µm, encompassing 10 orders of magnitude in sizes.Nano measuring devices are employed to measure smaller particles (< 1000 nm), while Aerosol Spectrometers are utilized for larger particles (> 180 nm). This presentation will specifically address ambient air measurement devices designed for particulate matter (PM10 and PM2.5) and ultrafine particles (UFP). The latest advancements in these devices will be highlighted, providing a brief explanation of their measuring principles, and showcasing noteworthy measurement results.
About speaker:
Dr. Markus Pesch has been working as Technical Director of GRIMM Aerosol Technik GmbH, Germany since 2008. He earned his PhD from Technical University of Berlin in 1997. His expertise lies in air quality control and the measurement of air pollutants. His research activities predominantly revolve around the detection of particulate matter and investigations into source apportionment. With numerous lead author research publications in various peer-reviewed scientific journals, he has made significant contributions to the field. He is a member of the German Society for Aerosol Research (GAeF) and served as chairman and presenter of several national and international aerosol conferences.
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17/11/2023 (Friday) 03:30 pm |
Dr. Vijayakumar S
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Effects of aerosols on the hydroclimate over Himalayas
Effects of aerosols on the hydroclimate over Himalayas
Abstract
Atmospheric aerosols influence the regional hydroclimate through several pathways. Aerosol radiative forcing affects the monsoon, heatwaves, and air quality over the South Asian region. The transport of absorbing aerosols like black carbon and dust to the Himalayan-Tibetan region raises a serious concern for the seasonal cycle of snow and thus the health of glaciers. The deposition of absorbing aerosols on the snow decreases its albedo and traps more radiation in the snowpack. This anomalous absorption increases the surface temperature and enhances the snow melt and runoff over this region. Though aerosol loading decreases with elevation, the aerosol-induced warming and snow cover change further strengthen the elevation dependence of warming trends observed over these high mountain regions due to global warming. Hence, the aerosol-induced snow albedo feedback has direct consequences for the increasing trend in surface temperature and depleting water resources over the Himalayan-Tibetan region. This forcing pathway is investigated using a regional climate model coupled with aerosols and snow modules and the effects of aerosol deposition on the hydrological cycle and regional climate over the Himalayan-Tibetan region will be discussed in detail during the presentation.
About speaker:
Dr. Vijayakumar S. Nair has been working as a Scientist at SPL-VSSC since 2011. He received his PhD from SPL in 2010. His research interests focus on Climate change, regional climate modelling, and Aerosol-Climate interactions. He as been authored and co-authored in 67 research papers published in peer-reviewed journals.He is an associate Editor of the Journal of Earth System Science and a reviewer of various peer-reviewed journals. He received several awards, including the prestigious Swarna Jayanti Fellowship in 2020.
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C201 -D2 |
28/09/2022 (Wednesday) 03:00 pm |
Prof. Manfred Wendisch
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The Arctic Climate System
The Arctic Climate System
Abstract
In the last 20 to 30 years, a new Arctic has developed right before our eyes in response to global warming. Truly substantial and rapid changes of Arctic climate parameters have been observed; they continue to proceed at an unexpected speed and vehemence. One prominent example of these ongoing climate changes is the dramatic decline of sea ice in the Arctic Ocean, which seems mainly be determined by atmospheric near-surface warming. Overall, the Arctic sea-ice cover observed at the end of summer has halved in the past 40 years. Another apparent sign of the current climate changes in the Arctic is the accelerated increase of the Arctic near-surface air temperature. Both and further obvious climate changes result from the elevated sensitivity of the Arctic climate system to global warming, compared to that at lower latitudes, which amplifies the impact of a variety of evolving local and remote processes and feedback mechanisms. The enhanced efficiency of these interlinked mechanisms is promoted by Arctic-specific characteristics (e.g., low sun, polar day and night, high surface albedo), and particular atmospheric circumstances (e.g., pronounced near-surface temperature inversions, frequent and persistent low-level clouds, widespread moisture inversions). Especially, mixed-phase clouds play a decisive role in feedback processes in the Arctic. The mechanisms behind the enhanced response of the Arctic climate system to global warming are generally referred to as Arctic amplification. The presentation will give a general overview of possible reasons for Arctic Amplification and discuss new findings in this area.
About speaker:
Prof. Manfred Wendisch is the Director of the Leipzig Institute for Meteorology (LIM), Germany since 2009. He received his PhD from Leipzig University in 1992. His research interests focus on the atmospheric and surface radiative energy budget. He has several lead authors research publications in various peer-reviewed scientific journals, and also wrote two important books. He is an associate Editor of the Journal on Atmospheric Measurement Techniques (AMT) and a member of the Editorial Board of the Bulletin of the American Meteorological Society (BAMS). He is the recipient of several awards, including the prestigious Georgi-Prize of the GeoUnion (Alfred-Wegener-Foundation) in 2022. He is serving as a member of several scientific bodies, including
1) German Meteorological Society (Deutsche Meteorologische Gesellschaft, DMG)
2) European Geosciences Union (EGU)
3) American Geophysical Union (AGU)
4) American Meteorological Society (AMS)
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25/03/2022 (Friday) 10:45 am |
Dr. Archana Pai, IITBombay
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Seeing unseen through gravitational waves-Lecture
Seeing unseen through gravitational waves-Lecture
Abstract
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16/03/2022 (Wednesday) 08:00 pm |
Dr. Daniel Murphy
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Using global observations to constrain the sinks and optical properties of aerosols by Dr. Daniel Murphy, NOAA, USA
Using global observations to constrain the sinks and optical properties of aerosols by Dr. Daniel Murphy, NOAA, USA
Abstract
Starting with chemically-resolved size distributions that our NOAA group measured during the Atmospheric Tomography mission, we can create data sets for species such as sea salt, dust, and smoke. These data sets are used to study aerosol removal from the atmosphere. Sea salt is especially good for this purpose because it has only surface sources and no photochemical removal. The size distributions can also be used to study how various species contribute to optical properties. For example, in the lowermost stratosphere the particles mixing down from above are much more important for optical properties than the particles mixing up from below, even when their overall mass is similar. The size distributions remind us that water uptake is crucial to the optical properties of aerosol particles. Since water content changes upon sampling, this shows the importance of ambient measurements of optical properties, including the sun photometer.
A brief bio-sketch of Dr. Daniel Murphy
Dr. Daniel Murphy works as a scientist at National Oceanic and Atmospheric Administration (NOAA) Chemical Sciences Laboratory Boulder, CO USA. He received his BS in Physics from Oberlin College, MS in Mechanical Engineering from Stanford University, and Ph.D. in Physics in the University of Minnesota. His research interests include single-particle mass spectrometry, global energy budget, microphysics of cold clouds, properties of ice and supercooled water weekly cycles of aerosols stratospheric aerosol layer, and aerosol instrumentation. He has several lead authors research publications in various peer-reviewed scientific journals. He has received several prestigious awards, including
1. 2002 US Department of Commerce: Gold Medal for scientific contributions to the third IPCC assessment,
2. 2008 American Association for Aerosol Research: Benjamin Liu award for aerosol instrumentation
3. 2010 NOAA: Bronze Medal for leadership of airborne Arctic mission
4. 2012 American Geophysical Union: Fellow
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12/02/2022 (Saturday) 12:00 am |
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Outreach discussion series with Public in Astronomy called ‘Ask an Astronomer’
Outreach discussion series with Public in Astronomy called ‘Ask an Astronomer’
Abstract
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18/12/2021 (Saturday) 12:00 am |
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Two day workshop on Astrobiology
Two day workshop on Astrobiology
Abstract
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22/11/2021 (Monday) 11:15 am |
Dr. Dimitrios A Karras,
School of Science,University of Athens
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The Application of Machine Learning and Artificial Intelligence in Early Warning Systems and Disaster Management-Lecture,
The Application of Machine Learning and Artificial Intelligence in Early Warning Systems and Disaster Management-Lecture,
Abstract
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20/10/2021 (Wednesday) 11:15 am |
Prof A. Chandrasekar,
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Climate Science- Research Contributions of ProfessorManabe and ProfessorHasselmann-Lecture,
Climate Science- Research Contributions of ProfessorManabe and ProfessorHasselmann-Lecture,
Abstract
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24/03/2021 (Wednesday) 03:30 pm |
Dr. C Gnanaseelan
Scientist ‘G’ and Project Director at IITM, MoES.
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Decadal Climate Variability, Predictability and Prediction
Decadal Climate Variability, Predictability and Prediction
Abstract
The Earth’s climate has changed considerably in the past. Periodic and episodic natural changes caused by natural climate forcing such as orbital variations and volcanic eruptions, and the feedback processes intrinsic to the climate system, have induced substantial changes in the climate system on a range of timescales. These natural and anthropogenic forcing are generally projected on to the internal dynamics of the climate system or climate variability. The least studied such variability are the decadal and multi-decadal variability mainly due to the non-availability of long term reliable climate data. A brief review of these variability such as Atlantic Multi-decadal Variability/Oscillation (AMV/AMO), Pacific Decadal Oscillation (PDO), Inter-decadal Pacific Oscillation (IPO), Indian Ocean Basin-wide Mode (IOBM) etc. and their possible impact on the Indian region will be presented. The recent advancement in the climate modelling provides some confidence for using them for climate variability studies. The current status of climate models in the predictability of the near term climate will be discussed. Decadal prediction is an emerging field in the area of climate science. Considering its potential applications, efforts are made to develop an India specific decadal prediction system, which will also be briefed
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27/01/2021 (Wednesday) 03:30 pm |
Dr. C M. Kishtawal
Former scientist and Group Director at Space Applications Centre.
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Applications of Satellite Observations for Numerical Weather Prediction
Applications of Satellite Observations for Numerical Weather Prediction
Abstract
Numerical Weather Prediction (NWP) is an initial value problem. An accurate analysis of the atmospheric state is a vital ingredient for skillful numerical weather predictions. Current observational requirements for global numerical weather prediction are met, to varying degrees, by a range of terrestrial and space-based observing systems. The characteristics of these observing systems will be discussed in the talk, that range from conventional in-situ instruments such as radio-sondes to remote-sensing profilers and satellite measurements, and their relative contributions to forecast accuracy. Since the introduction of the space-based technologies in the nineteen-seventies, impact studies have consistently shown satellite data to have the largest influence in the otherwise data-sparse southern hemisphere. However, the most recent indications are that this dominance is on the verge of spreading to the northern hemisphere, partly because of the introduction of data assimilation schemes that can utilize satellite information much more efficiently, and also due to emergence of new type of observation technology e.g. those based on GPS occultation, GPS reflectometry, laser based wind profilers etc. According to some studies, more than 90% of the data requirement by modern day NWP models is met by satellite observations. Interestingly, this is only 5% of the data that weather satellites produce routinely.
About the Speaker:
Dr. C.M. Kishtawal, former scientist and Group Director at Space Applications Centre, received his master’s degree in physics with specialization in astrophysics from Kumaun University, Nainital in 1983. He joined ISRO in 1984, and completed his Ph.D. from Indian Institute of Technology (Delhi) in 1994. His research interests include the development of techniques for operational prediction of tropical cyclones using satellite observations, monsoon prediction, operational retrieval of cloud motion winds from satellite observations, and impact of land surface processes on weather and climate, particularly the impact of agricultural intensification and urbanization. During 1998-1999 period he was research associate in Florida State University, USA, where he worked towards the development of multi-model ensemble technique for improvement of weather prediction on medium range to seasonal time scales. During 2009-2010, he was a visiting scientist at Purdue University, West Lafayette, USA, where he worked on observational and theoretical aspects of land surface-atmosphere interaction processes. He has 170 peer reviewed research publications in various scientific journals
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15/01/2021 (Friday) 07:30 pm |
Dr. K.Rajeev
Space Physics Laboratory (SPL), Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram
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Tropical Clouds
Tropical Clouds
Abstract
Clouds play a paramount role in the weather and climate of the earth-atmosphere system through a host of direct and feedback processes, which results in the vertical and horizontal transport of energy and moisture as well as the modulation of radiation balance, large-scale dynamics and thermal structure of the atmosphere. Detailed knowledge of the horizontal and vertical distribution of clouds, their properties and temporal evolution are of fundamental importance for understanding the genesis and impact of clouds and their feedback on the above processes. This is also important for investigating the unresolved issues in aerosol-cloud interaction, radiative impact of aerosols under cloudy conditions, heterogeneous chemistry in the atmosphere and improved parameterization of clouds for incorporating in weather and climate models. Interestingly, the distribution and properties of clouds derived from satellite observations have also revealed several new dynamical processes in the atmosphere.
This lecture will cover the 3-dimensional distribution of tropical clouds, their genesis and radiative impact based on the advancements in active and passive satellite remote sensing during the past decade. It will also cover some of the interesting aspects of the Indian summer monsoon revealed from such observations.
About the Speaker:
Dr. Rajeev obtained his Ph.D degree in Physics from Kerala University. Underwent WMO Class-I Meteorologist Training. He was Post-Doctoral Research Physicist at the Scripps Institution of Oceanography, University of California, San Diego, USA. Currently, he is heading the Microwave and Boundary Layer Physics Branch (MBLP), Atmospheric Technology Division (ATD) and Planning and Coordination Cell (PCC) of Space Physics Laboratory (SPL), VSSC. He is the Principal Scientist of the national IGBP-NOBLE Project. He is the Indian Representative to COSPAR and Member of the Research Advisory Committee of the Indian Institute of Geomagnetism, Mumbai and Indian Institute of Tropical Meteorology, Pune. Areas of research include Atmospheric Physics, Aerosols, Clouds, Radiation and Atmospheric Remote Sensing. He has published 70 research papers in peer-reviewed journals. Four researchers obtained Ph.D under his guidance. ISRO and NASA Earth Observatory released news items on his findings on aerosols, clouds and radiative impact.
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07/01/2021 (Thursday) 03:30 pm |
Dr. Ramakrishna Ramisetty
Research & Analytical Sales Manager for India for Particle Instruments Division of TSI Instruments India Private Limited
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Atmospheric Aerosol Measurement Techniques – Challenges and Opportunities
Atmospheric Aerosol Measurement Techniques – Challenges and Opportunities
Abstract
The study of primary and secondary aerosols is essential to understand their origin, evolution and effect on the atmosphere, human health and environment. The atmospheric aerosols distribute from 1nm to several microns, source can be natural or anthropogenic and very enigmatic. The study of the aerosols very crucial in new particle formations (NPF) studies in the atmosphere, cloud condensation nuclei (CCN) and Ice Nucleation (IN) studies. Also, the aerosols are the key components in the global warming and lot of adverse effects on human health. Various types of the aerosol studies viz. ground-based monitoring, satellite-based studies, theoretical modeling studies: all together give us decent knowledge on the aerosols despite every method has its advantages and disadvantages. The study of distributions of the aerosols is essential to track adequately around the world and a greater number of the experiments and the theoretical modelling studies necessary in the wide range of locations and at different sources to characterize the aerosol physical and chemical characteristics. Physical characterization of the aerosols: i.e. the size distribution, total number concentrations, total mass concentrations and surface area are very key parameters in order to understand the effect on the atmosphere. Similar, the chemical characterization of the aerosols is equally important to understand the source apportionment. The existing technologies in the aerosol measurements can be very useful to study them in real-time from ultra-fine to coarse particles. However, it is important to understand various technologies and the challenges in the aerosol monitoring. The limitations in the existing technologies and the necessity of more studies opened up huge number of opportunities in the field of the aerosol science and technology.
About the Speaker:
Dr. Ramakrishna Ramisetty is Research & Analytical Sales Manager for India for Particle Instruments Division of TSI Instruments India Private Limited.
His primary area of expertise is in Mass Spectrometry for Space & Atmospheric Physics & Chemistry. Rama, is now taking care particle instrumentation division at TSI India, in which he is working real-time aerosol measurement systems like particle sizers, counter, mass measurements systems, engine exhaust measurement systems and filter media efficiency measuring systems. Prior to joining at TSI, Rama worked as post-doctoral research scientist at Karlsruhe Institute of Technology, Karlsruhe, Germany and he worked new analytical techniques for single aerosol particle characterization. And also, he has participated in several field campaigns in Germany and Switzerland for aerosol measurements, air quality (urban & rural) studies. He also participated Aerosol Interaction and Dynamics in the Atmosphere (AIDA) chamber studies for CCN & IN studies. Rama’s earned his Ph.D. from University of Bern, Switzerland on designing, developing, calibrating the new noble gas mass spectrometer for space applications. He had Master’s degree in Physics Pondicherry University, Pondicherry, India.
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16/12/2020 (Wednesday) 01:00 pm |
Dr. Duncan Axisa
Droplet Measurement Technologies, LLC, Colorado (USA)
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New Particle Formation in the Mid-Latitude Upper Troposphere
New Particle Formation in the Mid-Latitude Upper Troposphere
Abstract
Primary aerosol production due to new particle formation (NPF) in the upper troposphere and the impact that this might have on cloud condensation nuclei (CCN) concentration can be of sufficient magnitude to contribute to the uncertainty in radiative forcing. This research involved the deployment of instruments, data analysis and interpretation of particle formation events during the Mid-latitude Airborne Cirrus Properties Experiment (MACPEX). The approach combined field measurements and observations with extensive data analysis and modeling to study the process of new particle formation and growth to CCN active sizes. It was found that the upper troposphere was an active region in the production of new particles by gas-to-particle conversion, that nucleation was triggered by convective clouds and mixing processes, and that NPF occurred in regions with high relative humidity and low surface area. A modeling study of particle growth and CCN formation was done based on measured aerosol size distributions and modeled growth. The results indicate that when SO2 is of sufficient concentration NPF is a significant source of potential CCN in the upper troposphere. In conditions where convective cloud outflow eject high concentrations of SO2, a large number of new particles can form especially in the instance when the preexisting surface area is low. The fast growth of nucleated clusters produces a particle mode that becomes CCN active within 24-hours.
About the Speaker:
Dr. Duncan Axisa is Droplet Measurement Technology’s Director of Science Programs. His primary area of expertise is in aerosol-cloud interactions, cloud microphysics, and weather modification. Duncan’s work at Droplet focuses on partnering with scientists and research laboratories to design science programs, develop funding proposals, and ensure that program activities are strategically conceived and executed to a high level of scientific accountability. Duncan earned his PhD in Engineering (with a focus in aerosol microphysics) from University of Denver, and a Master’s degree in Atmospheric Science (with a focus in aerosol-cloud interactions) from Texas A&M University. Prior to joining Droplet, Duncan worked at the National Center for Atmospheric Research (NCAR) conducting atmospheric science field programs using scientific instrumentation to investigate aerosol-cloud interactions, cloud and precipitation microphysics, new particle formation, and weather modification. He has participated in over 30 field campaigns including campaigns in the US, Europe, Australia, Arabian Peninsula, India and Asia
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25/11/2020 (Wednesday) 03:30 pm |
Prof. S. Ramachandran
Space and Atmospheric Sciences Division Physical Research Laboratory, Ahmedabad
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Atmospheric Aerosols
Atmospheric Aerosols
Abstract
We, humans, are familiar with air pollution. The pollutants referred to as aerosols are a major element in atmospheric and climate sciences. The aerosols, of different sizes and composition, are produced by natural sources and manmade activities. The talk will touch upon the multi-dimensional facets of aerosols - the science (physics, chemistry, maths, and biology), and engineering, and their importance.
About the Speaker:
Prof. Srikanthan Ramachandran obtained his B.Sc. (Special) in Physics from The American College, Madurai Kamaraj University, and Ph.D. from the Space and Atmospheric Sciences Division, PRL. His area of research includes measurements and characterization of aerosols in the troposphere and the stratosphere using state-of-the-art techniques as well as modeling their impacts on radiation budget, atmospheric temperature and climate using radiative transfer and general circulation/global climate models. He is a lead author of the 2007 climate science assessment of theIntergovernmental Panel on Climate Change (IPCC)which shared the 2007 Nobel Peace Prizee is a reviewer and an author on the World Meteorological Organization (WMO) Scientific Assessment of Ozone Depletion. He was a Senior Fellow at the Institute for Advanced Sustainability Studies, Potsdam, Germany in 2019. He was a Senior Fellow at the NASA Ames Research Center, California during 2008, and 2011-12 under the NASA Postdoctoral Program (administered earlier by the National Research Council (NRC)). He is a recipient of the Indian National Science Academy (INSA) Young Scientist Award (1997), and the NASA Group Achievement Award (2009). He has published about 100 research papers in peer-reviewed journals. He recently authored a textbook entitledAtmospheric Aerosols: Characteristics and Radiative EffectsCRC Press, Taylor and Francis Group, USA
More details about Prof. Ramachandran and his research can be found @ https://www.prl.res.in/~ram
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15/03/2019 (Friday) 03:00 pm |
Prof. Michael DeBecker
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The investigation of particle-accelerating colliding-wind binaries: a multi-wavelength endeavour
The investigation of particle-accelerating colliding-wind binaries: a multi-wavelength endeavour
Abstract
Massive stars are extreme stellar objects whose properties allow for the study of some interesting physical processes, including particle acceleration up to relativistic velocities. In particular, the collisions of massive star winds in binary systems are adequate environments to accelerate notably electrons involved in synchrotron emission. This leads to their identification as non-thermal radio emitters. To date, this has been demonstrated for about 40 objects. The relativistic electrons are also expected to produce non-thermal high-energy radiation through inverse Compton scattering. This class of objects permits thus to investigate non-thermal physics through observations in the radio and high energy spectral domains. However, the binary nature of these sources introduces some stringent requirements to adequately interpret their behavior and model non-thermal processes. In particular, these objects are well-established variable stellar sources on the orbital time-scale. The stellar and orbital parameters need to be determined, and this is notably achieved through studies in the optical domain. The combination of observations in various spectral domains is thus the key to investigate these particle-accelerating colliding-wind binaries, and achieve a clearer view of their role in stellar and galactic astrophysics.
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Lecture Hall C301, Science Block |
01/08/2018 (Wednesday) 03:30 pm |
Dr. Pushkar Kopparla
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Clearly cloudy? New insights into exoplanets from polarimetry
Clearly cloudy? New insights into exoplanets from polarimetry
Abstract
Abstract: Hot Jupiter exoplanets are now thought to lie on a continuum from clear to cloudy, based on the strength of absorption features in their transmission spectra. Atmospheric chemistry models predict the presence of exotic cloud compositions, such as silicates, metal oxides, chlorides and sulphides. But constraining cloud composition has remained a hard problem with traditional exoplanet observing techniques. Over the past few years, we conducted a series of observational and modeling efforts using polarimetry to observe and understand clouds in exoplanets. These efforts focused on studying scattered starlight from the atmospheres of HD 189733b and WASP 12b, two hot Jupiter exoplanets. I will discuss issues in the interpretation of these measurements and how they lead to some of the first constraints on the composition of exoplanet clouds. The last part of the talk will speculate on the uses of polarimetry for the study of Earth like exoplanets
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Seminar Hall, Aerospace Block (D4) |
30/05/2018 (Wednesday) 04:00 pm |
Prof. Jayaram Chengalur
National Centre for Radio Astrophysics (an institute affiliated to the TIFR)
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Imaging Techniques in Radio Astronomy
Imaging Techniques in Radio Astronomy
Abstract
Abstract: In this talk I will discuss image formation in radio astronomy. The primary complication that one has to deal with is that, because of the long wavelengths involved, high resolution imaging via direct image formation in the focal plane (as is typical at visible and other wavelengths), is not feasible. Instead radio astronomical imaging uses an indirect technique, viz. interferometry. In this talk (which will be largely pedagogical) I will set up the required framework for understanding how this imaging proceeds. I will also discuss several current challenges in high dynamic range imaging.
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Science Block (D2), Room No. C305 (3rd Floor) |
18/04/2018 (Wednesday) 04:15 pm |
Prof. Matthew Colless
Director of Research School of Astronomy and Astrophysics, Australian National University
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The Giant Magellan Telescope
The Giant Magellan Telescope
Abstract
The Giant Magellan Telescope (GMT) is a 25-metre optical and infrared telescope currently under construction by a consortium of 12 institutions from Australia, Brazil, Korea and the USA. It will cost US$1.3 billion, collect 6 times as much light as today's biggest telescopes, and produce images 5 times sharper than the Hubble Space Telescope and 3 times sharper than the James Webb Space Telescope. Using GMT, astronomers will be able to take images of planets around other stars, probe the atmospheres of these exoplanets, find super-massive black holes in galaxies throughout the universe, and perhaps detect some of the very first stars to form after the Big Bang. I will discuss the scientific goals of the GMT project, present the design of the telescope and its instruments, and report on the current status of its construction
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Lecture Hall 301 - D2 |
31/01/2018 (Wednesday) 03:30 am |
Dr. Henry Throop
NASA-funded Senior Scientist, Planetary Science Institute, Arizona, USA
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Are We Alone in the Universe?
Are We Alone in the Universe?
Abstract
For thousands of years, people on Earth have been asking, “Are we alone?” For much
of the timeline of humanity, we have been unable to answer that question. But in the last
decades, scientists have finally been able to begin in earnest the search for and study of
life in the universe. How did life form on Earth? Do planets like Earth exist elsewhere?
Could life exist on Mars, or the moons of Jupiter? Would distant life have the same carbon-based
chemistry and use liquid water like we do, or could it be wildly different? And if we found evidence
for life in distant solar systems, how would we even recognise it?
This talk will give an introduction to the field of astrobiology, including the search for distant life and
distant planets, a discussion of cosmic chemistry, and the search for our own origins on Earth. It will
discuss the best places in our solar system to search for the possible signs of life today, including
Europa and Enceladus, where warm oceans are hidden below thick layers of ice. Finally, it will finish
with an update on the latest findings from NASA's Mars Curiosity rover and Isro’s Mars Orbiter Mission
as they explore Mars, looking for clues to its ancient habitability
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Seminar Hall, D4 |
30/01/2018 (Tuesday) 03:30 am |
Dr. Henry Throop
NASA-funded Senior Scientist, Planetary Science Institute, Arizona, USA
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NASA’s New Horizons Mission to Pluto and Beyond
NASA’s New Horizons Mission to Pluto and Beyond
Abstract
After a nine-year journey though the solar system, astronomers visited Pluto for the first time in July 2015, using a robotic NASA spacecraft called New Horizons. Despite being a tiny, icy body far from the sun’s warmth, New Horizons found Pluto’s surface to be astonishingly young and active, showing a diverse variety of geology never before seen in the solar system. New Horizons Science Team member Dr. Henry Throop will tell the story of this NASA spacecraft mission, from its development and construction, through launch in 2006, to its successful encounter with Pluto, and plans for a flyby in the Kuiper Belt on 1 January 2019.
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Seminar Hall, D4 |
21/09/2017 (Thursday) 03:00 pm |
Dr. Thomas Oommen
Associate Professor, Michigan Technological University, USA.
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Theoretical Aspects of Interferometric Synthetic Aperture Radar (InSAR) Technology
Theoretical Aspects of Interferometric Synthetic Aperture Radar (InSAR) Technology
Abstract
Dr. Thomas Oommen completed his MS in Systems Engineering from the Department of Geological Engineering at the University of Fairbanks, Alaska. He received his PhD degree in Geotechnical and Geo-environmental Engineering from Tufts University, Massachusetts, USA, in 2010. He is an Associate Professor in the Department of Geological and Mining Engineering and Sciences at Michigan Technological University. His primary research activities are in the application of machine learning, image processing, and remote sensing for pre- and post-geohazard characterization. His research on landslide hazard has been supported by prominent funding agencies including NASA, NATO, and World Bank
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C201 D2 Building |
25/08/2017 (Friday) 03:30 pm |
Paula Bengalia
enior Prof. at Inicio - Universidad Nacional de La
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Massive stars with the GMRT
Massive stars with the GMRT
Abstract
Fundamental questions about massive stars (of eight solar masses or more) still remain unanswered, such as star formation itself, the stellar evolution, or related high energetic phenomena at different stages of their lives. The Giant Metrewave Radio Telescope (GMRT, Pune) is one of the best instruments to dwell in such unknowns. Through this presentation various research topics will be covered, together with their treatment and possible solution.
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Seminar Hall, D4 |
23/08/2017 (Wednesday) 03:00 pm |
Paula Bengalia
Senior Prof. at Inicio - Universidad Nacional de La
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A radio view of the Universe
A radio view of the Universe
Abstract
The talk consists of a subjective introduction to Radio Astronomy, its methods and its scope. Some of the drivers that lead to cutting-edge scientific research will be presented, related to non-solar stars, dwarf galaxies, unidentified energetic sources and other objects,revealing that particular science as a unique tool to display a hidden part of our Universe.
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Seminar Hall, D4 |
09/05/2017 (Tuesday) 02:00 pm |
Dr. Deepak Jaiswal
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Role of biofuel energy crops to displace fossil fuels
Role of biofuel energy crops to displace fossil fuels
Abstract
Despite being one of the low carbon intensive and renewable source of liquid fuels, Biofuels are often criticized for being in direct competition with food crops. Focus of this talk is on finding out whether there is enough land available for both food and biofuels. Modern civilization require both food and energy & the challenge of reducing pressure on land can be achieved by the use of dedicated energy crops. I combine soil, climate (historical and future), and land use data together with crop modeling and geospatial analyses to identify suitable locations for growing energy crops and quantify potential availability of biofuel feedstocks. I present results from two studies from the USA and Brazil on their respective potential of growing biomass for the production of biofuels. I also present a preliminary analysis on India to discuss the opportunities to build a biofuel-based bioeconomy that can contribute towards India´s energy independence and meeting India´s commitment of reducing [CO2] emission at the COP21.
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C305 |
21/04/2017 (Friday) 03:15 pm |
Sonu Tabitha Paulson
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Insights into Early Phases of High Mass Star Formation from 6.7 GHz Methanol Masers
Insights into Early Phases of High Mass Star Formation from 6.7 GHz Methanol Masers
Abstract
Massive stars play a key role in the evolution of the Universe. They are the principal source of heavy elements and UV radiation. In spite of the dominant role that massive stars play in shaping galactic structure and evolution, our understanding of their formation and early evolution is still sketchy. Several factors including higher dust extinctions make the study of early phases of high-mass star formation hard. A common phenomenon observed in active high-mass star-forming regions is the presence of interstellar masers. Masers have long been regarded as powerful probes of the kinematics of star formation region. Methanol masers at 6.7 GHz, in particular, are the brightest of class II methanol masers and have been found exclusively towards massive star forming regions
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D2-C305 |
22/03/2017 (Wednesday) 03:00 pm |
Dr Som Kumar Sharma
Associate Professor, Space & Atmospheric Sciences Div, Physical Research Laboratory
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Earth’s Middle Atmospheric Climate Change: Lidar and Satellite perspectives
Earth’s Middle Atmospheric Climate Change: Lidar and Satellite perspectives
Abstract
Earth’s atmosphere is a unique and having life supporting composition. In recent years there has been great concern of greenhouse effect in the atmosphere due to increased anthropogenic activities and its consequences in the global climate. Stratosphere is relatively stable/quiet but plays very vital role in deciphering various geophysical phenomena taking place in the Earth’s atmosphere. For more than three decades, Lidar has become a dynamic atmospheric probe for providing height profile of density/temperature in the middle atmospheric region. Nd: YAG laser based Rayleigh Lidar was installed, at a high altitude observatory near Mount Abu (24.5o N, 72.7o E, altitude1.7 km), in the Indian sub-tropical region, to study the Earth’s neutral atmospheric temperature structure.The system is transmitting pulses of 7 ns duration at a frequency of 10 Hz with average power of ~350 mJ at 532 nm. For the study of temperature climatology in the stratosphere-mesosphere, we have used the Rayleigh lidar and satellite observations for about last 17 years. The experimental and statistical errors in deriving temperature are found to be less than ~1 K below 50 km. The monthly mean temperature profiles obtained are compared with three different model atmospheres (CIRA-86, MSISE-90 and Indian low latitude model) and satellite observed temperatures. Below the stratopause, model and satellite temperatures are in agreement with the observed values. To study the year to year variability, mean monthly temperature profiles have been estimated for different years. The variability is least around 40-50 km with a value of 5 K. The mean stratopause height and its temperature are found to be 48 km and 270 K respectively. Atmospheric features, like the double stratopause structure around 40-52 km has also been observed. For the study of long term changes in the thermal structure of the Stratosphere, consistently good data series has been investigated. Monthly mean temperature profiles for each month individually have been used to remove seasonal variability. A multivariable analysis is used to consider natural variability (Solar Cycle and QBO) and similarly the changes in stratospheric ozone concentration due to anthropogenic activity have also been taken into account in trends estimations. We have selected different height layers 30-35, 36-40, 41-45 and 46-50 km for trends analysis. Linear Regression analysis is applied to calculate temperature trend in different altitude regions. Considering the signature of seasonal, QBO and solar cycle variability, decreasing temperature trend (cooling) in stratospheric temperature has been found. Observed stratospheric cooling, operative processes, and their implication on lower/middle atmosphere will be discussed.
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C305-D2 |
02/03/2017 (Thursday) 02:00 pm |
Pranav Manangath
Working on his PhD thesis in the Department of Physics and Astronomy University of Western Ontario, Canada
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Formation of substellar objects in a circumstellar disk
Formation of substellar objects in a circumstellar disk
Abstract
Gravitational collapse of a molecular cloud to form a star is almost always driven through a circumstellar disk. During the early phase of collapse, the disk can get nearly as massive as the protostar. This usually creates gravitational instabilities within the disk that can create fragmentation in the disk. These fragments will have masses from a few Earth mass to tens of Jupiter masses. Depending upon their central temperature these fragments can undergo a second collapse. Hence the circumstellar disk can act as an amniotic fluid for several types of astronomical objects: earth like planets, gas giants, brown dwarfs and even a companion star. I am presenting some results from our high resolution simulations of the collapse of a molecular cloud core. I discuss the properties of the fragments formed and identify proto-brown dwarf seeds and proto-planet seeds.
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C201
(next to ESS-HoD's office)
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23/02/2017 (Thursday) 02:30 pm |
Dr. Murali Mohan
Adviser/Scientist-G Interdisciplinary Cyber Physical Systems (ICPS) and Big Data Initiatives (BDI) Divisions Department of Science and Technology, Govt. of India.
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Interdisciplinary Cyber Physical Systems (ICPS) - R & D Perspectives
Interdisciplinary Cyber Physical Systems (ICPS) - R & D Perspectives
Abstract
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Seminar Hall |
23/02/2017 (Thursday) 01:30 pm |
Dr. M.Rajeevan
Secretary , Department of Earth Sciences, Govt of India
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Monsoon forecasting in India
Monsoon forecasting in India
Abstract
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Seminar Hall |
21/11/2016 (Monday) 03:30 pm |
Dr V K Dadhwal
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Enabling Smart cities through Geospatial Technologies
Enabling Smart cities through Geospatial Technologies
Abstract
Dr V K Dadhwal, our honourable Director is delivering a lecture titled "Enabling Smart cities through Geospatial Technologies" on 21 November 2016 at 3.30 pm.
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Seminar hall, D4 building |
05/10/2016 (Wednesday) 03:30 pm |
G Gopakumar
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Classification of Leukaemia cell lines
Classification of Leukaemia cell lines
Abstract
Microfluidics based Imaging flow cytometry is an emerging technology that combines the statistical power of flow cytometry with spatial and quantitative morphology of digital microscopy. It allows high throughput imaging of cells with good spatial resolution, while they are in flow. We proposed a general framework for the processing/classification of cells imaged using imaging flow cytometer. Each cell is localized by finding an accurate cell contour. Then, features reflecting cell size, circularity and complexity are extracted for the classification. We have successfully classified unstained label-free leukaemia cell-lines MOLT, K562 and HL60 from video streams captured using custom fabricated cost-effective microfluidics-based imaging flow cytometer. We have also proposed an extended framework that uses deep learning network as the classifier bypassing the need for accurate segmentation and the extraction of hand-held features. The proposed system, we believe, is a significant development in the direction of building a cost-effective cell analysis platform that would facilitate affordable mass screening camps looking cellular morphology for disease diagnosis.
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C-305 , D2 |
12/08/2016 (Friday) 02:30 pm |
Dr V K Dadhwal
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Challenges in Developing New Operational Remote Sensing Applications: NRSC Experiences
Challenges in Developing New Operational Remote Sensing Applications: NRSC Experiences
Abstract
Dr V K Dadhwal, our honourable Director is delivering a seminar titled "Challenges in Developing New Operational Remote Sensing Applications: NRSC Experiences" on 12 Aug 2016 as part of the IIST's celebration of Remote Sensing Day (August 12), the birth anniversary of Dr Vikram A Sarabhai. All are cordially invited.
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Seminar hall, D4 building |
04/05/2016 (Wednesday) 02:00 pm |
Dr. C. Venkateswara Rao Group Head, Data Processing Division, Nationa; Remote Sensing Centre, Dept. of Space, Hyderabad.
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Image Fusion Advance Methods and Applications
Image Fusion Advance Methods and Applications
Abstract
Although each sensor is designed to achieve a specific observation objective, the derived information may not be adequate to address all observation requirements for a given application. Such information need could be met through fusion of data from two or more sensors. This presentation explores novel fusion approaches for the spatial, spectral, temporal and radiometric resolutions of space borne sensors, and multimodalities of bio sensors. Spatial-spectral fusion method is demonstrated by using Fast Discrete Curvelet Transforms (FDCT) that improves the spatial resolution of a coarser multispectral image using small area coverage by a high resolution sensor. Spatial-radiometric fusion method is developed by using Wavelet Transforms that improves the radiometric resolution of the high spatial multispectral image. Spatial-temporal fusion method is developed through temporal high pass modulation that improves the temporal resolution of the high spatial resolution multispectral image. In medical imaging modalities, MRI has an advantage of high spatial resolution compared to the CT, PET, and SPECT imaging modalities. But each one of them has a specific advantage in diagnosing the disease. In this work, presented MRI-CT, MRI-PET and MRI-SPECT image fusion approaches by using Wavelet Transforms. Experimental results of MRI-CT image fusion demonstrated which can obtain the benefits of multimodalities fusion in information retrieval. The tomography sections of fused images are used for constructing 3D model to derive the complete information. Experimental results from sample targets are discussed for the potential opportunities to improve accuracy and confidence in precise information retrieval.
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C305-D2 |
23/03/2016 (Wednesday) 03:30 pm |
Prof. Prajval Shastri IIA
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Accreting Supermassive Black Holes, Relativistically Beamed Jets & the Blazar Divide
Accreting Supermassive Black Holes, Relativistically Beamed Jets & the Blazar Divide
Abstract
Supermassive black holes that are commonly found in the centres of galaxies appear to play a central role in galaxy evolution via black hole growth through accretion. A few such accreting supermassive black holes produce bipolar synchrotron emitting jets that are launched with bulk relativistic speeds. The consequent relativistic aberration has a dominant impact on how we see them. We discuss results from an investigation of the systematics of such accreting black holes using multi-wavelength data.
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C305-D2
(class room opposite to Astronomy lab)
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24/02/2016 (Wednesday) 03:00 pm |
K Arun Prasad
Research Scholar Dept. of Earth & Space Sciences
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Discrimination of closely related Mangrove Species using Laboratory Spectral Signatures
Discrimination of closely related Mangrove Species using Laboratory Spectral Signatures
Abstract
Mangrove vegetation community of tropical and sub-tropical coastline forms a perpetual natural resource which may be looking modest in terms of species diversity but it is an extremely complex ecosystem to evaluate. Mangrove forests are threatened by human interference, industrialization and natural causes. Indian east coast harbors about 85% of mangroves and members of Rhizophoraceae family are most important and abundant species among them. Rhizophoraceae family includes four genera namely Bruguiera, Ceriops, Kandelia and Rhizophora comprising of 18 species. Reflectance spectrometry provides interoperable pure reflectance of feature of interest from its in-situ measurement. Spectral discrimination had been studied using field and lab reflectance data of various vegetation types such as agricultural crops, Mediterranean species and also coastal vegetation including mangroves. The primary objective of this study is to determine the spectral discrimination among eight mangrove species of Rhizophoraceae family using their laboratory spectral reflectance data. Laboratory spectra of eight species were analyzed using parametric and non-parametric statistical estimates derived using spectral data in four spectral modes: a) reflectance spectra (RS), b) continuum removed reflectance spectra (CRRS), c) inverse spectra (IS) and d) continuum removed inverse spectra (CRIS) to find out wavelengths (bands) in which the spectral separability is statistically significant in each mode. From the results, it is observed that non-parametric test gave better separability than parametric test. Principal component analysis (PCA) and stepwise discriminant analysis (SDA) were applied for feature reduction and to identify optimal wavelengths for species discrimination. To quantify the separability, Jeffries–Matusita distance measure was derived. Green reflectance (550 nm), red edge (680–720 nm) and water absorption regions (1470 and 1850 nm) of the reflectance spectra were found to be optimal wavelengths for species discrimination. The proposed continuum removal of additive inverse spectra (CRIS) gave better separability than the continuum removed spectra (CRRS).
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C305 - D2 |
12/02/2016 (Friday) 04:00 pm |
Dr. Seetha
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Seminar
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D4, seminar hall |
20/01/2016 (Wednesday) 03:00 pm |
M Dhanya Research Scholar Dept. of Earth & Space Sciences
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Improved Rainfall Simulation by Assimilating Oceansat-2 Surface Winds Using Ensemble Kalman Filter for a Heavy Rainfall Event over South India
Improved Rainfall Simulation by Assimilating Oceansat-2 Surface Winds Using Ensemble Kalman Filter for a Heavy Rainfall Event over South India
Abstract
Data assimilation techniques combine observations with a model prediction of the state, known as the background, to provide a best estimate of the state, known as the analysis. Several approaches exist for estimating this analysis state which can be used for initializing a numerical weather prediction model. A better initial condition would, in principle, result in a better model forecast. This study investigates the impact of assimilating ocean surface wind vectors from ISRO’s Oceansat-2 satellite in simulating a heavy rainfall event over peninsular India. Two assimilation techniques, namely the ‘three dimensional variational technique (3DVar)’ and ‘Ensemble Kalman filter (EnKF)’, are utilized here. It is seen that assimilation of Oceansat-2 ocean surface wind vectors improves the simulation of the heavy rainfall event considered. The EnKF analysis is shown to give an improved rainfall forecast as compared with 3DVar analysis in this case.
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C305 - D2 |
04/11/2015 (Wednesday) 03:00 pm |
Jagadheep D
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Nobel Prize in Physics, 2015
Nobel Prize in Physics, 2015
Abstract
This year's Physics Nobel was awarded jointly to Takaaki Kajita and Arthur B. McDonald "for the discovery of neutrino oscillations, which shows that neutrinos have mass."
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D4, Seminar Hall |
28/10/2015 (Wednesday) 03:00 pm |
Ambili K M
Dept. of Earth & Space Sciences
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On the origin of ionosphere at Moon
On the origin of ionosphere at Moon
Abstract
The existence and characteristics of atmosphere and ionosphere at Moon has remained an enigmatic question in front of the scientific community. The ionosphere at Moon nevertheless has been shown to be highly variable ( 10^5 to 1-2 electrons/cc) as there are several factors which control the plasma density in the Lunar ionosphere. Important among them are the ultraviolet flux from the sun, and solar wind flux density. Debates are still going on among scientists on various explanations and observations of lunar ionosphere. Measurements have been used from Chandrayaan-I to understand the Ionosphere at Moon and its possible origin. The presence of ionosphere at Moon was explored by Radio Occultation technique using Chandrayaan-1 communication link between orbiter and ground (S-band frequency). The observed density of 300-1000 electrons/cc matches well with the Soviet mission, namely Luna-19 and Luna-22. With the help of a photo chemical model it is proved that the Moon can have a ionosphere which has molecular origin.
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Seminar Hall |
16/10/2015 (Friday) 03:00 pm |
Vinoj V IIT, Bhubaneswar
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Atmospheric Aerosols and the Indian Summer Monsoon Rainfall
Atmospheric Aerosols and the Indian Summer Monsoon Rainfall
Abstract
The Indian monsoon is one of the important components of the global circulation system and brings copious seasonal rainfall. It is the result of a complex inter-relation between surface and atmospheric radiative heating, dynamics and also the aerosol effects as is shown by recent investigations. Despite increased scientific interest in the recent past, the effect of aerosols on monsoon still remains elusive. In this talk, I will primarily discuss on our current knowledge regarding how aerosols affect Indian summer monsoon rainfall and then will discuss in more detail a recent study which shows aerosols can have an impact on monsoon even remotely. In the past, studies (using observational and modeling approaches) have focused on aerosol induced local climate effects on seasonal timescales, but shorter-term and non-local links have not been explored or identified. I will present observational evidence and also numerical modeling results to demonstrate that a remote link exists between aerosols over the Arabian Sea/West Asia and the Indian summer monsoon rainfall. Our simulations support this link and indicate that the variability in dust aerosol loadings influence atmospheric radiative heating that can induce changes to larger scale circulation changes over Arabian Sea thereby modulating the moisture transport and convergence over central India. This leads to changes in monsoon rainfall on a relatively short time scales (~ a week). This investigation highlights the importance of natural aerosols in modulating/influencing the strength of the Indian summer monsoon, motivating additional research in how changes in background aerosols of natural origin may be affecting the monsoon rainfall.
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Seminar Hall |
07/10/2015 (Wednesday) 03:00 pm |
Samir Mandal
Dept. of Earth & Space Sciences
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ASTROSAT: India's first fully dedicated astronomy satellite
ASTROSAT: India's first fully dedicated astronomy satellite
Abstract
Indian astronomy satellite ASTROSAT has been launched on 28th September, 2015. The satellite contains five scientific payloads covering a wide range in electromagnetic spectrum, from optical to high energy X-ray. In this talk, I am going to present an overview of different instruments, their working principles and the scientific highlights.
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Seminar Hall |
15/05/2015 (Friday) 02:30 pm |
Dr. Senthil Kumar
Director - Indian Institute of Remote Sensing, Dehra Dun
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Data Quality Assurance of Remote Sensing data products
Data Quality Assurance of Remote Sensing data products
Abstract
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Seminar Hall |
27/02/2015 (Friday) 03:30 pm |
Dr. Arabindo Roy
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Lessons learnt from Herschel Gould Belt Survey observations
Lessons learnt from Herschel Gould Belt Survey observations
Abstract
In this talk I will present two key topics addressed by Herschel Gould Belt Survey (HGBS) observations -- 1) observational constrain on the submillimeter dust opacity and 2) the importance of filamentary structures in connection with prestellar core formation. Theoretically, interstellar dust grains are expected to evolve in dense medium by accreting ice mantles and accumulating metals. Using dust continuum emission and near infrared extinction data we show an evidence for non-linear evolution of dust opacity in the moderately dense medium as a function of column density, suggestive of grain growth. We used Abel's integral transform on the B68 globule to disentangle temperature variation and compared dust opacity therein. This method also yielded successful results for the reconstruction of volume density and dust temperature structures. HGBS observations have also demonstrated the importance of filamentary structures in connection with core formation. Thermally supercritical filaments (M_line > 2c_s^2/G) host most of the prestellar cores and the derived core mass function (CMF) suggested that peak of the CMF corresponds to the Jeans mass of gravitationally unstable filaments, however, the origin of Salpeter like power-law slope towards high mass end was unclear. I will also discuss that the longitudinal perturbation modes seeded by Kolomogorov turbulence may explain the power-law part of the CMF.
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Smart Class Room (C106) - D4 |
26/11/2014 (Wednesday) 10:00 am |
Dr. John C Mathew MG University, Kottayam
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Applications of Geospatial tools in Environmental Sciences
Applications of Geospatial tools in Environmental Sciences
Abstract
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Council Room - D4 |
09/09/2014 (Tuesday) 03:00 pm |
Prof. Jean Surdej Institute of Astrophysics and Geophysics, University of Liège
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Observing multiply imaged quasars with the 4m International Liquid Mirror Telescope
Observing multiply imaged quasars with the 4m International Liquid Mirror Telescope
Abstract
I shall first remind the basic properties of gravitational lens systems and how these can be used to derive interesting astrophysical and cosmological parameters. I shall specially address the case of symmetric gravitational lens systems for which such parameters can be derived irrespective of the assumed lens model.I shall then describe the 4m International Liquid Mirror Telescope project and explain how this telescope, to be be soon erected on the ARIES site in Devasthal (Uttarakhand), will be used to detect and monitor approximately 50 cases of multiply imaged quasars.
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Seminar Hall D4 |
03/09/2014 (Wednesday) 03:00 pm |
Mr. P Shashidhar Reddy Scientist, NRSC Hyderabad
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Virtual Reality applications to Remote Sensing
Virtual Reality applications to Remote Sensing
Abstract
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VR Lab - D4 |
03/09/2014 (Wednesday) 02:00 pm |
Dr. Tapas Ranjan Martha Scientist, NRSC Hyderabad
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Object Based Image Analysis applications to Remote Sensing
Object Based Image Analysis applications to Remote Sensing
Abstract
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VR Lab - D4 |
14/08/2014 (Thursday) 12:00 pm |
Dr. P G Diwakar Deputy Director, Remote sensing Applications, NRSC, Hyderabad
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Remote Sensing Day, 2014: Lecture on Earth Observation Satellites and Applications
Remote Sensing Day, 2014: Lecture on Earth Observation Satellites and Applications
Abstract
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Seminar Hall – D4 |
23/07/2014 (Wednesday) 03:00 pm |
Kaustubh Vaghmare Inter University Center for Astronomy & Astrophysics, Pune
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What Can Images Tell Us About Galaxies?
What Can Images Tell Us About Galaxies?
Abstract
This talk assumes no expertise in the field of extragalactic astronomy. On the contrary, it is aimed especially at students initiating themselves in the field of astronomy. Basic astronomy and Physics will of course be assumed. The talk will start with classification of galaxies and move on to describe the technique of deriving various parameters for galaxies using images. I shall then cover how simple analysis of these parameters can unravel various relationships which in turn can be used to unravel the physical nature of these systems and how they may have formed. In the process, I shall also introduce a relatively fresh area of research which I hope will be of interest to both beginners and experts.
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C106 - D4 |
06/05/2014 (Tuesday) 03:30 pm |
Prof. T. R. Seshadri Dept. of Physics, Univ. of Delhi
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CMB Polarization and the Bicep2 Results
CMB Polarization and the Bicep2 Results
Abstract
The Cosmic Microwave Background Radiation, while being almost isotropic, unpolarized and with a black body Spectrum, has minute amounts of anisotropy in temperature and polarization and potential deviations form the Plank distribution. The talk will primarily focus on some the nature of CMB Polarization and different physical phenomena that can cause it. The B-mode polarization results in the context of BICEP will also be discussed.
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Conference Room - D4 |
16/04/2014 (Wednesday) 03:00 pm |
Prof. Avinash Deshpande RRI, Bangalore
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Fascinating life stories of pulsars
Fascinating life stories of pulsars
Abstract
Pulsars are believed to be strongly magnetized, fast rotating neutron stars with over 2000 discovered in our Galaxy so far. In the long march towards the elucidation of the mysterious ways of pulsars, a few special ones have taught us more than most of the rest put together. Apart from sharing our understanding of the origin and evolution of these cosmic light-houses, the lecture will try to highlight a few illustrious members of the pulsar family, and focus on some of the key messages they bring to us.
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Seminar Hall D4 |
21/02/2014 (Friday) 01:15 pm |
Prof T.N. Krishnamurti Department of Earth, Ocean and Atmospheric Science, Florida University
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A Monsoonal link to the rapid Arctic ice melt
A Monsoonal link to the rapid Arctic ice melt
Abstract
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Seminar Hall – D4 |
29/01/2014 (Wednesday) 03:30 pm |
Dr. Ashish Mahabal Sr. Research Scientist, California Institute of Technology, USA
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What you can do for astronomy?
What you can do for astronomy?
Abstract
The title is of course politically incorrect, and should be 'what astronomy can do for you', but I just want to emphasize some of the big projects one can get in to right now and aid astronomy and science and add to the knowledge of the universe. And the big projects are not big time and money projects like LIGO-India or the Thirty Meter Telescope, but big data projects that involve large datasets, with large number of dimensions and computing ability but often only modest computing power. I will introduce the subject, the typical datasets, various projects, and computing tools needed.
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C106 - D4 |
20/08/2013 (Tuesday) 09:30 am |
Dr. R. R. Navalgund Former Director -SAC, Vikram Sarabhai Distinguished Professor – ISRO HQ
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Indian Remote Sensing Programme: A Saga of 25 year
Indian Remote Sensing Programme: A Saga of 25 year
Abstract
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D4 |
12/06/2013 (Wednesday) 12:00 pm |
Dr. S G Rajeev University of Rochester
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Mathematical Astronomy in Medieval Kerala
Mathematical Astronomy in Medieval Kerala
Abstract
Kerala had a very advanced school of astronomy and mathematics in the 14th - 16th century AD. Among their achievements were a theory of infinite series, algorithms to calculate the circumference of a circle, sin, arctan, square roots. They also developed a heliocentric model with accurate measurements of the length of each month, stopping short of discovering Kepler's laws of planetary motion. The talk will be an overview of this period of mathematics and astronomy in Kerala, highlighting some of these achievements.
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C106 - D4 |