The threshold of parallel whistler-mode instability

Details The threshold of parallel whistler-mode instability The threshold of parallel whistler-mode instability

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9...30s&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, Jan. 1991, p. 30-33. Research supported by NERC.

Physics

5

Magnetospheric Electron Density, Magnetospheric Instability, Wave Propagation, Whistlers, Distribution Functions, Earth Magnetosphere, Radio Emission

Scientific paper

Based on a weakly relativistic consideration of the condition of marginal stability of parallel whistler-mode waves, it is pointed out that these waves tend to be stabilized by a reduction of electron density. As a result the range of whistler-mode instability for a given value of anisotropy of electron distribution function can differ up to a factor of two for the range of electron densities typical for magnetospheric conditions. This effect, not noticed so far, needs to be taken into account when interpreting observations of whistler-mode waves in the magnetosphere.

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