Janardhan Padmanabhan, FNA
Phone: (+91) 79 2631 4610
(O);
(+91) 79 2686 0261 (R);
e-mail :
jerry AT prl.res.in Janardhan.Padmanabhan AT gmail.com
Solar, Solar Wind and Solar Radio Studies :
My research covers a wide range of interests from radio studies of the sun and the solarwind, with emphasis on "Space Weather" studies using observations of Interplanetary Scintillation (IPS) and meter wavelength solar imaging observations. Aditionally, I have an interest in studies of solar photospheric magnetic fields, radio observations of comets, experimental studies of astrochemical ices, shock processing of molecules, and exo-planets. Over the past decade I have been involved in scentific payload development for solar studies and led the development, as Principal Investigator (PI), of the Aditya Solarwind Particle Experiment (ASPEX) payload onboard India's first observatory-class Mission ADITYA-L1 to study the sun from the L1 Lagrangian Point of the sun-earth system. ADITYA-L1 was launched on on 02 September 2023.
In recent times, I have been persuing a detailed study of solar magnetic fields and solar wind micro-turbulence levels. Both of these have been steadily decreasing from around the early to mid nineties. Our studies strongly suggests that we are probably headed for another Maunder like solar minimum beyond solar cycle 25. I have also been involved in Solar Radio Astronomical studies via meter wavelength solar imaging observations carried out using a new technique of combining visibilities from the Giant Meterwave Radiotelescope (GMRT) facility at NCRA,TIFR, Pune and the Nancay Radio Heliograph in France.
Awards:
International Collaborations:A Study of rms Electron Density Fluctuations in Cometary Ion Tails - In collaboration with the Australia Telescope National Facility, Australia. Detection of Ammonia and Water in Comet Hale-Bopp - In collaboration with the Radioastronomisches Institute, Bonn, Germany. Coronal Velocity Measurements using the Ulysses Spacecraft - In collaboration with the Radioastronomisches Institute, Bonn, Germany. A Study of the acceleration Regime of the Solar Wind using Ulysses - In collaboration with the Radioastronomisches Institute, Bonn, Germany. Detection of Extremely High Velocity Disturbances Launched by Solar Flares using the VLA - In collaboration with the University of Maryland, USA. A Study of Solar Wind Disappearance Events - In collaboration with the Solar Terrestrial Environmental Laboratory, Nagoya University, Japan. Understanding the Cause of Very Low Density Solar Wind Flows at 1 AU - In collaboration with the University of Cambridge, UK. Callibrating the Brazillian Decametric Array using GPS Signals - In collaboration with the Institute for Space Physics (Instituto Nacional de PesquisasEspaciais, INPE), Brazil. A Study of Solar Magnetic Fields over the Past three Solar Cycles - In collaboration with the Institute Space-Earth Environment (ISEE), Research, Nagoya University, Japan. High Dynamic Range and High Resolution Solar Imaging Studies using the Giant Meterwave Radio Telescope and The Nancay Radio Heliograph - In collaboration with the Observatoire de Paris, France. |
Scientific Reports and News Reports:
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