Low-frequency waves and electric fields in the magnetospheric current sheets

Details Low-frequency waves and electric fields in the magnetospheric current sheets Low-frequency waves and electric fields in the magnetospheric current sheets

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1002h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Feb. 1, 1988, p. 1002-1006.

Mathematics

1

Current Sheets, Earth Magnetosphere, Plasma Oscillations, Space Plasmas, Atmospheric Attenuation, Electric Fields, Field Aligned Currents, Lines Of Force, Vectors (Mathematics), Vibration Mode

Scientific paper

Low-frequency disturbances in a plasma immersed in a force-free magnetic field B0 characterized by a zero-order field-aligned current J are analyzed in the short-wave approximation. A parallel electric field often substantially modifies the properties of waves in the typical current sheets in the near-earth magnetosphere. The mode of oscillations corresponding in the limit J = 0 to the Alfven mode is partly or totally absorbed on the auroral oval field lines. Conditions under which optimum absorption occurs are pointed out. The second mode of oscillations, which correspond to the compressional wave in the limit J = 0, is not substantially affected by the magnetospheric current sheets.

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