S
S. Gopi Krishna
Researcher at Andhra University
Publications - 10
Citations - 700
S. Gopi Krishna is an academic researcher from Andhra University. The author has contributed to research in topics: Total electron content & TEC. The author has an hindex of 7, co-authored 9 publications receiving 605 citations.
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Temporal and spatial variations in TEC using simultaneous measurements from the Indian GPS network of receivers during the low solar activity period of 2004-2005
TL;DR: In this paper, the authors presented the temporal and spatial variations in TEC derived from the simultaneous and continuous measurements made, for the first time, using the Indian GPS network of 18 receivers located from the equator to the northern crest of the equatorial ionization anomaly (EIA) region and beyond, covering a geomagnetic latitude range of 1° S to 24° N, using a 16-month period of data for the low sunspot activity (LSSA) years of March 2004 to June 2005.
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On the validity of the ionospheric pierce point (IPP) altitude of 350 km in the Indian equatorial and low-latitude sector
TL;DR: In this paper, the authors examined the validity of the IPP altitude of 350 km in the Indian zone comprising of the everchanging and dynamic ionosphere from the equator to the ionization anomaly crest region and beyond, using the simultaneous ionosonde data from four different locations in India.
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Study of spatial and temporal characteristics of L-band scintillations over the Indian low-latitude region and their possible effects on GPS navigation
TL;DR: In this article, the scintillation data (S4-index) at the L-band frequency of 1.575GHz, recorded from a total of 18 GPS receivers installed at different locations in India under the GAGAN project, have provided a unique opportunity, for the first time in the Indian region, to make a simultaneous study of spatio-temporal and intensity characteristics of the trans-ionospheric scintillations during the 18-month, low sunspot activity (LSSA) period from January 2004 to July 2005.
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Local time dependent response of postsunset ESF during geomagnetic storms
S. Tulasi Ram,P. V. S. Rama Rao,D. S. V. V. D. Prasad,K. Niranjan,S. Gopi Krishna,R. Sridharan,Sudha Ravindran +6 more
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.
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VHF and L-band scintillation characteristics over an Indian low latitude station, Waltair (17.7 N, 83.3 E)
P. V. S. Rama Rao,S. Tulasi Ram,K. Niranjan,D. S. V. V. D. Prasad,S. Gopi Krishna,N. K. M. Lakshmi +5 more
TL;DR: In this article, a detailed study on the spectral characteristics of the scintillations at both the frequencies was performed at Waltair (17.7° N, 83.3° E) during the low sunspot activity year of March 2004 to March 2005, and the occurrence of scintillation is mainly due to two types, namely the Plasma Bubble Induced (PBI) and Bottom Side Sinusoidal (BSS) type, which maximizes during the post-midnight hours of the summer solstice months.