VHF backscatter radar observations of Type I waves during a counter electrojet event

Details VHF backscatter radar observations of Type I waves during a counter electrojet event VHF backscatter radar observations of Type I waves during a counter electrojet event

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2047s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 18, p. 2047-2050

Physics

6

Backscattering, Electrojets, Radar Tracking, Very High Frequencies, Doppler Effect, Electron Density (Concentration), Magnetohydrodynamic Stability, Phase Velocity

Scientific paper

The paper presents simultaneous observations made at Trivandrum (Dip - 0.5 deg N) during a strong counter electrojet event using VHF backscatter 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 m/s can be generated in the presence of a destabilizing gradient. This gives direct experimental evidence that the electron density gradient will affect the type I threshold velocity, sometimes substantially.

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