Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9811689m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A7, p. 11,689-11,700.
Physics
21
Harmonic Radiation, Ion Cyclotron Radiation, Magnetospheric Proton Density, Plasma Waves, Plasmapause, Space Plasmas, Wave Generation
Scientific paper
An analytical study of ion cyclotron harmonic wave generation in space plasmas is investigated, with emphasis on strictly perpendicular propagation of fast Alfven waves. In the case of a monoenergetic proton ring in a cold plasma, it is shown that cyclotron harmonics can have a higher growth rate than parallel-propagating ion cyclotron waves, depending on the ratio of the proton ring speed to the Alfven speed. Analytical stability boundaries in parameter space are determined. The threshold for the growth of cyclotron harmonics is found to depend critically on the ion plasma beta, beta(i). If beta(i) is much less than 1, e.g., in the radiation belts or the auroral zones, the concentration of ring protons required for instability is very low. If beta(i) is about 1, e.g., in the bow shock or the solar wind, instability will occur only if the ring protons constitute a large fraction of the total ion density.
Dendy R. O.
McClements K. G.
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