Physics
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..705l&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 8, p. 705-710.
Physics
1
Auroral Zones, Electric Fields, Electron Precipitation, Lines Of Force, Magnetohydrodynamic Stability, Doppler Effect, Low Frequencies, Plasma Equilibrium
Scientific paper
Precipitating electrons and upward-moving ion beams can drive a low frequency electrostatic instability on the auroral field lines in the presence of cold background electrons. Precipitating electrons with drift speed corresponding to a fraction of (0.04-0.4) of their thermal speed, and cold ion beams with streaming velocity about 100-1500 km/s can generate low-frequency electric field fluctuations in the frequency range of 10 exp -2 Hz to about 130 Hz. The low frequency waves propagate nearly transverse to the auroral field lines. Quasi-linear analysis shows that, for these modes, the electric field amplitude can be few times 10 mV/m to as high as 1 V/m. These modes can heat electrons and ions mainly in the parallel direction, and thus cannot produce ion conics which require perpendicular ion heating.
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