Ion beam heating in the auroral zone

Details Ion beam heating in the auroral zone Ion beam heating in the auroral zone

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.1015s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Feb. 1, 1990, p. 1015-1028. Research supported by the Lockheed Indepe

Physics

13

Auroral Zones, Ion Accelerators, Ion Beams, Magnetospheric Instability, Plasma Heating, Earth Magnetosphere, Geomagnetic Tail, Magnetohydrodynamic Stability

Scientific paper

Recent satellite observations at high altitudes (above 5000 km) in the auroral zone have shown the existence of hybrid or bimodal ion beam distributions that are evidence of both parallel and perpendicular ion acceleration. To study the nonlinear effects of the ion-ion instability in terms of plasma heating, a numerical simulation parametric study has been performed. It was found that the parallel acceleration that forms the ion beams occurs on a time scale faster than ion-ion wave growth at low drifts; thus ion-ion wave growth is expected to occur primarily for higher drift speeds, which results in strong oblique heating of the ions (both hydrogen and oxygen) forming elevated ion conics.

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