Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714779w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,779-14,799.
Physics
36
Computerized Simulation, Earth Magnetosphere, Ion Cyclotron Radiation, Magnetohydrodynamic Stability, Space Plasmas, Field Aligned Currents, Ion Beams
Scientific paper
Linear theory and 1D and 2D hybrid simulations are employed to study electromagnetic ion/ion cyclotron (EMIIC) instability driven by the relative streaming of two field-aligned ion beams. The characteristics of the instability are studied as a function of beam density, propagation angle, electron-ion temperature ratios, and ion beta. When the propagation angle is near 90 deg the EMIIC instability has the characteristics of an electrostatic instability, while at smaller angles electromagnetic effects play a significant role as does strong beam coupling. The 2D simulations point to a narrowing of the wave spectrum and accompanying coherent effects during the linear growth stage of development. The EMIIC instability is an important effect where ion beta is low such as in the plasma-sheet boundary layer and upstream of slow shocks in the magnetotail.
Omidi Nojan
Winske Dan
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