Electron distributions produced by kinetic Alfven waves on auroral field lines

Details Electron distributions produced by kinetic Alfven waves on auroral field lines Electron distributions produced by kinetic Alfven waves on auroral field lines

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72d..04l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72D-04

Physics

2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 2752 Mhd Waves And Instabilities

Scientific paper

A non-local kinetic theory has been developed to describe the interaction between electrons and Alfvén waves on auroral field lines, including the mirroring of electrons by the dipole magnetic field. Calculations of the relative wave power converted to particle acceleration have been performed. For the model density profile considered, the peak power dissipated occurs for a plasma sheet temperature of 1 keV, a frequency of 0.2 Hz, and a perpendicular wavelength of about 10 km. At frequencies above 0.1 Hz, the power dissipated has a sensitive dependence on the frequency due to the effect of the ionospheric Alfven resonator. At lower frequencies, the wave reflects from the region of large parallel electric field, and so the ionospheric conductivity does not affect the results. The variations in the electron distributions will be considered, with emphasis on the energy flux of electrons precipitating into the ionosphere. The effective current-voltage relation as a function of the frequency of the Alfven waves will be determined.

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