Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1531a&link_type=abstract
Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1531-1543.
Physics
53
Convection, Cyclotron Radiation, Earth Magnetosphere, Electron Plasma, Electrostatic Waves, Harmonic Radiation, Magnetohydrodynamic Stability, Distribution Functions, Electron Energy, Electron Precipitation, Magnetospheric Electron Density, Particle Diffusion
Scientific paper
The article discusses nonconvective and convective electron-cyclotron harmonic instabilities. Particularly, the spatial growth rates of electrostatic waves in an electron plasma having hot and cold components and a weak loss cone perpendicular velocity distribution are investigated. It is found that the cold-electron density controls which harmonic band may be excited and that the cold-electron temperature controls spatial amplification. The nonconvective property is found for several hot and cold electron densities, and is noted to persist even when the hot-electron loss cone is nearly filled. It is suggested that the nonconvective property is removed by cold-electron heating. In this way the spatial amplification of instabilities may be reduced to a level consistent with their hot- and cold-electron sources in steady state.
Ashour-Abdalla Maha
Kennel Charles F.
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