VHF BACKSCATTER RADAR OBSERVATIONS OF TYPE-I WAVES DURING A COUNTER ELECTROJET EVENT

Authors
SOMAYAJULU VV SELVAMURUGAN R DEVASIA CV CHERIAN L
Citation
Vv. Somayajulu et al., VHF BACKSCATTER RADAR OBSERVATIONS OF TYPE-I WAVES DURING A COUNTER ELECTROJET EVENT, Geophysical research letters, 21(18), 1994, pp. 2047-2050
Citations number
11
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Geophysical research letters → ACNP
ISSN journal
00948276
Volume
21
Issue
18
Year of publication
1994
Pages
2047 - 2050
Database
ISI
SICI code
0094-8276(1994)21:18<2047:VBROOT>2.0.ZU;2-G
Abstract
The paper presents simultaneous observations made at Trivandrum (Dip - 0.5-degrees-N) during a strong counter electrojet event using VHF bac kscatter radar, Ionosonde and Magnetometer. The VHF backscatter radar observations of 2.7 m scale size irregularities have shown that Type I waves with phase velocities in the range of 180-220 ms-1 can be gener ated in the presence of a destabilizing gradient. This gives direct ex perimental evidence that the electron density gradient will affect the type I threshold velocity, sometimes substantially.