|
NISCAIR ONLINE PERIODICALS REPOSITORY (NOPR) >
NISCAIR PUBLICATIONS >
Research Journals >
Indian Journal of Radio & Space Physics (IJRSP) >
IJRSP Vol.35 [2006] >
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]
|
|
