HF radar studies of two-stream instability during an equatorial counter-electrojet

Details HF radar studies of two-stream instability during an equatorial counter-electrojet HF radar studies of two-stream instability during an equatorial counter-electrojet

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.5223c&link_type=abstract

Journal of Geophysical Research, vol. 84, Sept. 1, 1979, p. 5223-5233. Research supported by the Universite de Toulon et du Var

Physics

9

Equatorial Electrojet, Magnetohydrodynamic Stability, Plasma Dynamics, Radar Echoes, Daytime, Electric Fields, Incident Radiation, Phase Velocity

Scientific paper

The equatorial counter-electrojet observed on January 21, 1977 in Africa was investigated using simultaneous magnetic and radar measurements. As predicted by the linear theory, irregularities associated with the two-stream instability were detected in the absence of the usual turbulence related to the cross-field effect (or type 2 irregularities). Horizontal or quasi-horizontal plasma waves were also detected together with the usual oblique waves. Spectra associated with oblique waves which do not have the usual behavior of type 1 was observed by a radar along with type H spectra associated with horizontal or quasi-horizontal waves. It is presumed that the quasi-linear reduction of the polarization electric field at the bottom of the instability layer explains the constant value of the phase velocity of the horizontal waves.

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