Electromagnetic instabilities in a gyrotropic and nongyrotropic hybrid solar-wind-like plasma

Details Electromagnetic instabilities in a gyrotropic and nongyrotropic hybrid solar-wind-like plasma Electromagnetic instabilities in a gyrotropic and nongyrotropic hybrid solar-wind-like plasma

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326799a&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A11, p. 26799-26804

Physics

1

Magnetospheric Physics: Plasmasphere

Scientific paper

We study the stability of electromagnetic waves for nongyrotropic velocity distribution functions in a solar-wind-like plasma. The dispersion relation is solved numerically in closed form. On the basis of recently reported observations of such plasma distribution functions in the solar wind at 1.3 AU, we study the instabilities of transverse electromagnetic waves propagating in the direction of an external magnetic field driven by ion beams and thermal anisotropies. We show that electromagnetic waves have three instability bands in the frequency range, 0<ω<Ωp, Ωp<ω<2Ωp, and 2Ωp<ω<3Ωp. Our results are illustrated by using parameters consistent with observed nongyrotropic plasma distribution function in the solar wind.

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