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IJRSP Vol.35(4) [August 2006] >


Title: HF Doppler radar observations of vertical and zonal plasma drifts–Signature of a plasma velocity vortex in evening F-region
Authors: Sreehari, C V
Bhuvanendran, C
Nayar, S R Prabhakaran
Keywords: Equatorial ionosphere
HF Doppler radar
Vertical drift
Pre-reversal enhancement
Zonal drift
Plasma drift
vortex
Issue Date: Aug-2006
Publisher: CSIR
Abstract: The simultaneous vertical and zonal plasma drift measurements using an HF Doppler radar system around March equinox of 1995 at the magnetic equatorial station, Trivandrum, India (8.33°N, 77°E, dip 0.4°N) are analyzed to evaluate the vector plasma drift at the F-region. It is found that the pre-reversal enhancement in vertical drift and the direction change of zonal drift from westward to eastward occur almost simultaneously. The velocity vector in the vertical-zonal plane, the resultant of vertical and zonal velocities, exhibits a gradual rotation in the evening time. The characteristics of velocity vector clearly promulgate the existence of a plasma velocity vortex in the equatorial F-region during post-sunset period.
Page(s): 242-248
ISSN: 0367-8393
Source:IJRSP Vol.35(4) [August 2006]

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