Computer Science
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..598l&link_type=abstract
Planetary and Space Science, vol. 25, June 1977, p. 598-600.
Computer Science
3
Cold Plasmas, Cyclotron Frequency, Magnetohydrodynamic Stability, Whistlers, Earth Magnetosphere, Graphs (Charts), Plasma Diffusion
Scientific paper
Excitation of the whistler instability in an anti-loss-cone plasma is investigated by assuming anti-loss-cone distributions for electrons. Effects of a cold plasma that might be present along with the hot anti-loss-cone plasma are taken into account. The results show that the whistler mode can become unstable at frequencies above the electron cyclotron frequency, the growth rates can be of the order of 0.1 times the electron cyclotron frequency, and an increase in the ratio between the parallel thermal speeds of trapped and missing electrons can reduce the growth rate. It is also found that a cold plasma has a slight destabilizing effect for low values of the parameter determining the strength of the anti-loss cone but has a strong stabilizing influence for strength-parameter values of approximately unity, that the real whistler frequency will be determined by the cold plasma, and that the whistler anti-loss-cone instability will be completely quenched for cold/anti-loss-cone electron-density ratios of at least unity.
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