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http://nopr.niscair.res.in/handle/123456789/3911
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 |
URI: | http://hdl.handle.net/123456789/3911 |
ISSN: | 0367-8393 |
Appears in Collections: | IJRSP Vol.35(4) [August 2006] |
Files in This Item:
File | Description | Size | Format | |
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IJRSP 35(4) 242-248.pdf | 69.64 kB | Adobe PDF | View/Open |
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