HF Doppler observations of vertical plasma drifts in the evening F region at the equator

Jayachandran, B. ; Balan, N. ; Nampoothiri, S. P. ; Rao, P. B. (1987) HF Doppler observations of vertical plasma drifts in the evening F region at the equator Journal of Geophysical Research, 92 (A10). pp. 11253-11256. ISSN 0148-0227

Full text not available from this repository.

Official URL: http://www.agu.org/pubs/crossref/1987/JA092iA10p11...

Related URL: http://dx.doi.org/10.1029/JA092iA10p11253

Abstract

Hf Doppler observations of vertical plasma drifts in the evening F region of the equatorial ionosphere at Trivandrum (8.5°N, 77°E; dip 0.9°S) are presented. The observations reveal a consistent pattern characterized by a post-sunsent enhancement with peak drift velocity in the range 30-60 m s-1 for quiet conditions. Under moderately disturbed conditions, the enhancement is found to be down by as much as a factor of 2, while no such appreciable change is noted for highly disturbed conditions. The pattern of drift velocity dependence on mangnetic activity is seen to be consistent with that of spread F occurrence. A striking feature of the observations is the presence of a significant fluctuating component in the drift velocity with quasiperiods ranging from a few minutes to a few tens of minutes during both quiet and disturbed periods.

Item Type:Article
Source:Copyright of this article belongs to American Geophysical Union.
ID Code:40538
Deposited On:24 May 2011 14:38
Last Modified:24 May 2011 14:38

Repository Staff Only: item control page