On propagation mechanisms of localized field-aligned currents in the magnetosphere

Details On propagation mechanisms of localized field-aligned currents in the magnetosphere On propagation mechanisms of localized field-aligned currents in the magnetosphere

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..111n&link_type=abstract

(Chapman Conference on Plasma Waves and Instabilities in Magnetospheres and at Comets, Sendai, Japan, Oct. 12-16, 1987) Journal

Physics

6

Field Aligned Currents, High Energy Electrons, Magnetohydrodynamic Waves, Magnetosphere-Ionosphere Coupling, Space Plasmas, Wave Propagation, Boundary Value Problems, Particle Motion, Propagation Velocity, S Waves

Scientific paper

Two different mechanisms for field-aligned current propagation, i.e., the Alfven wave and the ballistic motion of energetic electrons associated with a localized source, are examined with linear kinetic theory. The characteristics of these two mechanisms and the relationship between them are investigated as an initial value problem. It is shown that in addition to the shear Alfven waves, the ballistic motion of electrons can also carry currents with the perpendicular scale comparable to the electron inertia length. The propagation speeds of these currents are independent of the Alfven speed.

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