Ray-tracing study of the plasmapause effect on non-ducted whistler-mode wave propagation

Details Ray-tracing study of the plasmapause effect on non-ducted whistler-mode wave propagation Ray-tracing study of the plasmapause effect on non-ducted whistler-mode wave propagation

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..425h&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, March 1991, p. 425-434.

Physics

5

Plasmapause, Propagation Modes, Ray Tracing, Wave Propagation, Whistlers, Electron Cyclotron Heating, Gyrofrequency, Ionospheric Propagation

Scientific paper

The effect of the plasmapause on whistler-mode wave propagation and generation is investigated by means of the two-dimensional ray tracings started at the equator over a wide frequency range, Lambda0 = 0.1-1.0 (Lambda0 wave frequency normalized by the equatorial gyrofrequency) and for a wide range of the initial wave normal angle theta0. Efficient gradient trapping is recognized at the inner edge of the plasmapause (especially with strong gradient) for lower frequency (Lambda0 less than 0.4) waves with smaller initial theta0(S) (-40 to +40 deg) generated at the equator. Lower-frequency waves generated at the equator inside the plasmapause are found to have an access to low-altitude satellites and to ground, and their transmission latitude is slightly smaller than the plasmapause location. The outer edge of the plasmapause (especially with weak gradient) is also found to act as a guide for higher frequency (Lambda greater than 0.5) waves.

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