Sudha Ravindran

TL;DR: In this paper, the authors analyzed the ionospheric variations in terms of Total Electron Content (TEC) for the low solar activity period from April 2005 to December 2007, and found that TEC at Rajkot is at its maximum during Equinoctial months (March, April, September, October), and minimum during the Winter months (November, December, January, February), with intermediate values during Summer months (May, June, July, August), showing a semi annual variation.

TL;DR: In this paper, the authors report the results of a multi-instrumental (ground-based and space-borne) and multistation study on the development/inhibition of postsunset ESF during five moderate to intense geomagnetic storms occurred during the low and descending phase of the solar activity period, 2004-2006.

TL;DR: In this paper, the diurnal pattern of total electron content (TEC) at a chain of equatorial to low-latitude stations shows strong positive ionospheric storm on 15 May.

TL;DR: In this paper, a systematic study was conducted to identify the precursors for the onset of VHF scintillations over a low-latitude station, Waltair (20° N dip), during high (2001) and low (2004) sunspot activity years.

TL;DR: In this article, backscatter radar observations at and off the magnetic equator (Trivandrum and Gadanki, respectively) have been analyzed to study the small scale (∼3 m) irregularities at E region altitudes.