Heating of thermal helium in the equatorial magnetosphere - A simulation study

Details Heating of thermal helium in the equatorial magnetosphere - A simulation study Heating of thermal helium in the equatorial magnetosphere - A simulation study

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.8281o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 1, 1985, p. 8281-8292.

Physics

57

Atmospheric Heating, Computerized Simulation, Earth Magnetosphere, Equatorial Atmosphere, Helium Ions, Plasma-Electromagnetic Interaction, Ion Cyclotron Radiation, Protons

Scientific paper

The heating of He(+) ions observed by the GEOS satellite at L of about seven starting from an initial anisotropic proton distribution is studied. A simulation of electromagnetic ion cyclotron waves in a plasma consisting of hot anisotropic protons, a dominant thermal hydrogen plasma, and a minority species of helium ions is utilized. It is shown that the thermal ions are heated to 100 times their initial temperature due to the growth of large-amplitude ion cyclotron waves. He(+) ions are heated mainly in the perpendicular direction, and they are heated more than cold H(+) ions. The He(+) ions are heated in a two-step process. First, they are set into oscillations by the growing wave until some of the ions reach a parallel velocity on the order of the resonant velocity; then, strong heating occurs.

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