D Pallamraju is a Senior Professor and Dean, Physical Research Laboratory & Chair, Space and Atmospheric Sciences. His research interests are investigations of the equatorial, mid- and high-latitude upper atmospheric phenomena, investigation of coupling among various altitude regions of the earth’s atmosphere, investigation of neutral and plasma dynamics during quiet and disturbed geomagnetic conditions, Space Weather effects in the Earth’s upper atmosphere and exploring new methods for upper atmospheric research. He was Managing Guest Editor of Journal of Atmospheric and Solar Terrestrial Physics (JASTP) Special Issue: Atmospheric Coupling Processes in the Sun-Earth System. D Pallamraju was elected Fellow of IASc in 2023.
Session 2C: Inaugural Lectures by Fellows/Associates
Rajiva Raman, Varanasi
Aurora and Airglow: Tracers of SpaceWeather
Earth has a large-scale axial dipole magnetic field, a fact of historical importance Space has always fascinated humans. Although we can see the light from the stars and galaxies with the unaided eye, there is yet another light, the “airglow”, in the intervening medium in the near-earth environment that gets unnoticed to an unaided eye. Understanding the brightness variations of airglow is important for fundamental investigations of the physics of sun–earth interactions. Studies of airglow and its counterpart the “aurora” serve as crucial tracers to gain fundamental knowledge of space weather. Space weather studies are also relevant for societal applications as we are increasingly dependent on space-based technologies in our day-to-day life and space weather is adversely affected by solar–terrestrial interactions. Several methods have been developed to remotely sense aurora and airglow to infer the weather (e.g., wave propagation, temperatures, winds, density variability, etc) of the atmosphere at the altitude of their origin. We have brought in innovations in the measurements of these emissions in the presence of strong daytime solar-scattered background-continuumin several spectral regions. These experiments have led to new insights into the daytime upper atmospheric dynamics. This talk will attempt to give a flavour of these new advancements.