Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..462k&link_type=abstract
Journal of Geophysical Research, vol. 84, Feb. 1, 1979, p. 462-468.
Physics
Cyclotron Resonance, Electrostatic Waves, Magnetohydrodynamic Stability, Plasma Resonance, Plasma Temperature, Anisotropy, Landau Damping
Scientific paper
The paper investigates the possibility that waves propagating near 90 deg can be produced as a result of a realistic instability. The key process to be considered is the change of the wave vectors during the relaxation from the initial anisotropic state to the final isotropic state. A model case is studied, within the framework of linear theory, for 3/2 electron cyclotron harmonic waves in the relaxation stage of a bi-Maxwellian velocity distribution. Attention is given to how the growth rate and the propagation angle of electrostatic electron cyclotron harmonic waves change while the temperature anisotropy decreases to unity after the waves are generated by the Harris instability. It is found that substantial increases in the propagation angle take place during the relaxation process. Strong Landau damping reduces the range of allowed propagation angles to a few degrees and suppresses the high-frequency part of the spectrum.
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