Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99..235w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A1, p. 235-239
Other
9
Electron Cyclotron Heating, Electron Density (Concentration), Electron Energy, Relativistic Particles, Earth Magnetosphere, Magnetohydrodynamic Stability, Plasma Density, Wave Propagation
Scientific paper
We show that an energetic electron distribution which has a temperature anisotropy (T perpendicular to b is greater than T parallel to b), or which is gyrating about a DC magnetic field, can generate electron cyclotron waves with frequencies below the electron cyclotron frequency. Relativistic effects are included in solving the dispersion equation and are shown to be quantitatively important. The basic idea of the mechanism is the coupling of the beam mode to slow waves. The unstable electron cyclotron waves are predominantly electromagnetic and right-hand polarized. For a low-density plasma in which the electron plasma frequency is less than the electron cyclotron frequency, the excited waves can have frequencies above or below the electron plasma frequency, depending upon the parameters of the energetic electron distribution. This instability may account for observed Z mode waves in the polar magnetosphere of the Earth and other planets.
Goldstein Michel L.
Wong Hung K.
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