Relativistic effects on parallel whistler-mode propagation and instability

Details Relativistic effects on parallel whistler-mode propagation and instability Relativistic effects on parallel whistler-mode propagation and instability

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.166..301s&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 166, no. 2, April 1990, p. 301-313. Research supported by the Stichting Ma

Astronomy and Astrophysics

Astrophysics

9

Relativistic Effects, Space Plasmas, Whistlers, Earth Magnetosphere, Electromagnetic Radiation, Plasmasphere, Wave Propagation

Scientific paper

Relativistic effects on parallel whistler-mode propagation and instability are considered analytically in some limiting cases relevant to magnetospheric and/or astrophysical conditions. The corresponding wave dispersion equation for a weakly relativistic anisotropic plasma is expressed in terms of generalized Shkarofsky functions. Asymptotic presentation of these functions is found in the limit of large wave refractive indices. Based on this presentation, a new analytical expression for whistler-mode refractive index is obtained and analyzed. It is pointed out that relativistic effects increase the value of anisotropy above which the waves are unstable, in agreement with the results of the earlier numerical analysis. This increase is particularly important for whistler-mode propagation in a rarefied, hot plasma but could be potentially observed in the magnetosphere of the earth in the region outside the plasmasphere.

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