Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..93a&link_type=abstract
2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe
Astronomy and Astrophysics
Astrophysics
Scientific paper
An important component of ionospheric plasma irregularity studies in the Indian low latitudes involves the study of the plasma bubbles which produce intense scintillations of the transionospheric satellite signals. In order to investigate the dynamics of plasma density irregularities of different scale sizes, a campaign of observations was conducted during 11 to 15 September 2005 at Gadanki (geog.13.450N, 79.170E, geomag. Coor. 4.440N, 151.730E), an Indian station. A low latitude spread F event occurred over India during the campaign at the night of 15 September 2005. The observations using dual frequency GPS receiver, VHF coherent backscatter radar, and two ionosondes with some latitudinal separation has been made. Range type spread F on ionograms and radar plume signatures on range-time-intensity maps of the VHF radar on the same day was observed. Using the GPS receiver, the association of the fluctuations in the intensity (S4 ~ 0.36 and 0.39) with the depletions in total electron content ( 5 and 12 TECU) are seen on the same day which affect the positional accuracy of the GPS by 0.8m and 1.92m. The drift velocity is observed to be high (~30 m/s) and the plasma drift is maximum at 1915LT. The irregularities are observed first at Trivandrum (equatorial station) at 1915hrs, then is observed by GPS receiver and then by VHF radar (off- equatorial station) indicating that the observed bubble is drifting eastward.
Aggarwal Madan M.
Iyer K. N.
Joshi H. P.
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