Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007basi...35..631a&link_type=abstract
Bulletin of the Astronomical Society of India, Vol. 35, p. 631--637
Astronomy and Astrophysics
Astronomy
Equatorial Spread F, Scintillation, Gps, Vhf Radar, Ionosonde
Scientific paper
An important component of ionospheric plasma irregularity studies at low latitudes involves the study of the plasma bubbles which produce intense scintillations of trans-ionospheric satellite signals. In order to investigate the dynamics of plasma density irregularities of different scale sizes, a campaign of multi-technique observations was conducted during 11 to 15 Sep.05 at Gadanki (geog.13.45°N, 79.17°E, dip latitude 6.4°N), an Indian station. A low latitude spread F event occurred during the campaign on the night of 15 Sep.05. The observations were made using dual frequency GPS receiver and VHF coherent backscatter radar from Gadanki and two ionosondes with some latitudinal separation, from Trivandrum and SHAR. Range type spread F on ionograms and radar plume signatures on range-time-intensity maps of the VHF radar were observed. Using the GPS receiver, the amplitude scintillation index (S_4) enhancements by 0.36 and 0.39 with two depletions in total electron content (5 and 12 TECU) are seen. The vertical plasma drift velocity is observed by ionosonde to be high (˜35 m/s) which maximized around 1915 LT, which coincided with onset of range type spread F over the magnetic equator, Trivandrum. The irregularities are observed first at Trivandrum at 1915 hrs, thereafter by GPS receiver and later by VHF radar (off-equatorial station) indicating that the observed bubble is drifting eastward.
Aggarwal Malini
Iyer K. N.
Joshi H. P.
Patra Amit Kumar
Thampi Smitha V.
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