Field-aligned current generation from MHD waves in the terrestrial magnetosphere

Details Field-aligned current generation from MHD waves in the terrestrial magnetosphere Field-aligned current generation from MHD waves in the terrestrial magnetosphere

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993p%26ss...41...57d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 41, no. 1, p. 57-63.

Physics

3

Earth Magnetosphere, Electron Cyclotron Heating, Field Aligned Currents, Ion Cyclotron Radiation, Magnetohydrodynamic Waves, Electron Distribution, Landau Damping, Plasma-Particle Interactions

Scientific paper

The quasilinear Fokker-Planck approach was used to show that magnetohydrodynamic (MHD), lower hybrid, whistler, electron-cyclotron, and ion-cyclotron waves present in the magnetosphere can generate a noninductive dc current aligned with the ambient magnetic field. The efficiency of current generation was determined for Cherenkov damped waves. Current generation by kinetic shear Alfven waves is considered for plasma-pause electrons. The wave-power dissipation necessary to generate currents at the Birkeland current level was calculated. It is shown that the ideal MHD shear Alfven wave cannot generate a dc field-aligned current by Cherenkov damping as it has no field-aligned electric or magnetic fields.

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