Ray-tracing studies and path-integrated gains of ELF unducted whistler mode waves in the earth's magnetosphere

Details Ray-tracing studies and path-integrated gains of ELF unducted whistler mode waves in the earth's magnetosphere Ray-tracing studies and path-integrated gains of ELF unducted whistler mode waves in the earth's magnetosphere

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.6181h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Aug. 1, 1983, p. 6181-6187.

Physics

19

Earth Magnetosphere, Plasmasphere, Radiation Belts, Ray Tracing, Wave Interaction, Whistlers, Electron Distribution, High Energy Electrons, Landau Damping, Plasmapause, Wave Propagation

Scientific paper

Gyroresonance and Landau resonance interactions between unducted low-frequency whistler waves and trapped electrons in the earth's plasmasphere have been studied. Ray paths for waves launched near the plasmapause have been traced. In agreement with recent findings by Thorne et al. (1979), waves have been found which return through the equatorial zone with field-aligned wave normal angles. However, when the growth along the ray path is calculated for such waves, assuming an electron distribution function of the form E exp -n sin exp m alpha, it is found that for all the waves considered, the local growth rate becomes negative before plasmapause reflection, limiting the total gain to small values. Most waves reach zero gain before reflection. This is the result of Landau damping at oblique propagation angles, which necessarily occurs before reflection can take place. It is concluded that the concept of cyclic ray paths does not provide an explanation for the generation of unguided plasmaspheric hiss.

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