Ion-ion waves in the auroral region - Wave excitation and ion heating

Details Ion-ion waves in the auroral region - Wave excitation and ion heating Ion-ion waves in the auroral region - Wave excitation and ion heating

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.5655d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, June 1, 1988, p. 5655-5664. NOAA-supported research.

Other

25

Auroral Zones, Ionic Waves, Plasma Heating, Plasma Waves, Space Plasmas, Wave Excitation, Auroral Arcs, Energy Transfer, Ion Acoustic Waves, Lines Of Force, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves

Scientific paper

The properties of the ion-ion mode which is excited in plasmas when two or more cold ion beams are streaming relative to one another are investigated assuming a warm electron distribution at rest (the model consistent with particle distributions observed in auroral plasma cavities). Numerical solutions are derived for the generalized electrostatic dispersion equation for parallel propagation and for oblique propagation of ion waves. It is shown that the relative ion temperature and concentration have significant effects on the stability of the accelerated plasma and the expected ion heating. Finally, a relationship between ion drift and thermal speed is derived using the marginal stability of ion-ion waves for nonzero ion temperature; the relationship was found to compare favorably with DE-1 ion observations at the high-altitude boundary of the auroral cavity.

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