Amplification of ion-cyclotron waves for various typical radial profiles of magnetospheric parameters

Details Amplification of ion-cyclotron waves for various typical radial profiles of magnetospheric parameters Amplification of ion-cyclotron waves for various typical radial profiles of magnetospheric parameters

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38.1191p&link_type=abstract

(International Union of Radio Science and International Association of Geomagnetism and Aeronomy, Symposium on the Physics of th

Physics

5

Anisotropic Media, Ion Cyclotron Radiation, Magnetic Field Configurations, Magnetohydrodynamic Waves, Magnetospheric Instability, Plasma Density, Atmospheric Models, Cold Plasmas, High Temperature Plasmas, Plasma Frequencies, Plasma Waves, Radial Distribution

Scientific paper

The influence of magnetospheric parameters (such as cold and hot plasma densities, anisotropy, and thermal energy of the hot particles) on the growth rate of ion cyclotron waves is investigated in detail. Following the inward penetration of protons having different parallel resonant energies (ER), the integrated growth rate (Gamma) at any radial distance (L) is computed, and plots of iso-Gamma contours in the ER - L plane are presented. Conditions for large amplification inside or outside the plasmasphere are discussed. A comparison between the energy (EM) of the 'most interacting' protons (those which interact with frequencies for which Gamma is maximum) and the parallel thermal energy of the distribution has been made in order to determine which part of the distribution function is involved in the interaction. Comparison is also made between EM and the critical energy. Some conclusions regarding the proton precipitation patterns are drawn. The present calculations do not suffer from any approximation and are valid for any cold-to-hot plasma density ratio.

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