Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..49..317v&link_type=abstract
Astrophysics and Space Science, vol. 49, no. 2, July 1977, p. 317-330.
Astronomy and Astrophysics
Astrophysics
2
Electromagnetic Wave Transmission, Magnetohydrodynamic Stability, Magnetospheric Instability, Plasma-Electromagnetic Interaction, Propagation Modes, Cyclotron Radiation, Earth Magnetosphere, Electron Energy, Ion Motion, Transverse Waves, Velocity Distribution
Scientific paper
Growth rates are computed for the right- and left-hand modes of a transverse electromagnetic wave propagating in an isotropic loss-cone plasma consisting of mobile electrons and ions. A double-humped isotropic loss-cone velocity distribution is considered, the thermal component is assumed to be effectively cold, and wave interaction with an energetic component having a modified Lorentzian distribution function for each species is investigated. Numerical results are obtained for a case typical of the magnetospheric plasma. These results indicate that: (1) electromagnetic waves can be unstable in a mirror geometry if the energetic plasma component is sufficiently monochromatic; (2) the nearly monochromatic fluxes observed in the magnetosphere are not monochromatic enough to trigger an instability; (3) an initial injection of monochromatic particles into the ambient magnetospheric plasma may have been much more sharply peaked than observed and probably relaxed to the observed distribution as a result of wave-particle interactions; and (4) electromagnetic waves in the magnetosphere can contribute to the relaxation of such an initial injection.
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