Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..353o&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 10, April 1983, p. 353-356.
Physics
3
Atmospheric Models, Auroral Zones, Ion Beams, Ion Cyclotron Radiation, Space Plasmas, Ion Distribution, Landau Damping, Maxwell-Boltzmann Density Function, Simulation, Velocity Distribution
Scientific paper
Results are presented of a particle simulation study of the electrostatic ion-cyclotron (EIC) instability driven by a parallel ion beam. The results of this simulation study demonstrate the nonlinear consequences of nonresonant EIC waves destabilized by an ion beam parallel to the magnetic field for the case of a large beam velocity. As a consequence of the instability, it is shown that the beam ions are heated strongly in the perpendicular direction and suffer a strong anomalous friction via EIC waves which leads to the beam slowing down. Simulation results indicate that the anomalous slowing down of beam ions by EIC waves is much larger than that from the classical electron-drag, and the perpendicular collision frequency measured from perpendicular beam heating is as large as that from Bohm diffusion. It is concluded that the ion beam driven EIC wave is a viable mechanism for the transfer of ion parallel beam energy to the ion perpendicular energy.
Ashour-Abdalla Maha
Miura Akira
Okuda Haruyuki
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