We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Study of equatorial spread F using L-band and VHF radar.
- Authors
Aggarwal, Malini; Joshi, H. P.; Iyer, K. N.; Patra, A. K.; Thampi, Smitha V.
- Abstract
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 (S4) 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.
- Subjects
F region; IONOSPHERE; PLASMA gases; SCINTILLATION of artificial satellites; SHORTWAVE radio; RADAR; GPS receivers
- Publication
Bulletin of the Astronomical Society of India, 2007, Vol 35, Issue 4, p631
- ISSN
0304-9523
- Publication type
Article