Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..357t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, May 1989, p. 357-360.
Physics
8
Ion Motion, Magnetohydrodynamic Waves, Magnetosonic Resonance, Particle Acceleration, Plasma-Particle Interactions, Cyclotron Resonance, Energetic Particles, Stochastic Processes, Wave Interaction
Scientific paper
A subharmonic-resonant interaction between ions and magnetohydrodynamic waves propagating perpendicular to the background magnetic field, B(0) is investigated. This interaction occurs at frequencies which are subharmonics of the cyclotron frequency of ions. It is found that this interaction becomes quite effective if the wave magnetic field delta B exceeds about 10 percent of B(0). Further, when delta B exceeds about 50 percent of B(0), ions have stochastic orbits in the wave and are accelerated with quite high efficiency. This subharmonic resonant interaction can play quite significant roles in the ion heating/acceleration processes in space plasmas, where large amplitude waves are not unusual.
Nambu Mitsuhiro
Terasawa Toshio
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