Dynamics Explorer observations of equatorial spread F - Evidence for drift waves

Details Dynamics Explorer observations of equatorial spread F - Evidence for drift waves Dynamics Explorer observations of equatorial spread F - Evidence for drift waves

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..993h&link_type=abstract

Geophysical Research Letters, vol. 9, Sept. 1982, p. 993-996.

Other

11

Dynamics Explorer Satellites, Equatorial Atmosphere, F Region, Ionospheric Drift, Satellite Observation, Spread F, Electric Fields, Electrostatic Probes, Ionospheric Electron Density, Magnetohydrodynamic Stability, Plasma Drift

Scientific paper

Recent DE-2 data from the Langmuir probe, vector electric field, and ion drift meter instruments are employed to study equatorial spread F in the frequency regime of the low frequency drift and the lower hybrid drift instabilities. Strong electron density gradients topside equatorial F region correspond to regions of high electric field waves and large ion drift velocities. The electric field waves are seen in two distinct wavelength ranges which correspond to the parameter regimes of the low frequency drift and the lower hybrid drift instabilities. In the smaller of the two wavelength ranges the lower hybrid drift instability is found to be unstable, based on the ion drift velocity and the other plasma parameters measured on DE-2, and using published theory. Thus there is experimental evidence that the lower hybrid drift instability may produce the observed short wavelength waves without invoking a cascading mechanism.

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