Variation of type 1 plasma wave phase velocity with electron drift velocity in the equatorial electrojet

Details Variation of type 1 plasma wave phase velocity with electron drift velocity in the equatorial electrojet Variation of type 1 plasma wave phase velocity with electron drift velocity in the equatorial electrojet

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821581r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,581-21,591

Physics

7

Drift Rate, Electron Plasma, Equatorial Electrojet, Geomagnetism, Magnetic Storms, Phase Velocity, Plasma Drift, Plasma Waves, Electric Fields, Magnetohydrodynamic Stability, Plasma Diffusion, Plasma Heating

Scientific paper

Using a 54.95-MHz coherent backscatter radar at Thumba (8.5 deg N, 77 deg E; 0.5 deg N dip angle), the phase velocity variations of type 1 plasma waves generated by the modified two-stream instability process in the equatorial electrojet have been measured on several occasions of large and rapid electric field flunctuations associated with geomagnetic substorms and storms. The measurements show a clear linear variation of type 1 wave phase velocity (VIp) over a considerable range with the simultaneously measured phase velocity (VIIp) of gradient drift instability-generated type 2 plasma waves. Since VIIp is porportional to the drift velocity of electrons, the observed variations of VIp with VIIp mean that VIp varies in step with the variations of the electron drift velocity Vey. The observed variation of VIp with Vey is consistent with the current theoretical understanding that the plasma wave-associated electric fields cause anomalous electron diffusion and heating which result in the stabilization of the type 1 wave phase velocity near the increased value of the ion-acoustic velocity. The enhanced electron temperatures estimated from the largest values of the observed VIp are found to be 2.0 - 2.4 times the ambient value in the absence of waves.

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