Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9413579t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Oct. 1, 1989, p. 13579-13583. Research sponsored by DOE and DNA.
Physics
8
Beam Plasma Amplifiers, Collisionless Plasmas, Ion Beams, Space Plasmas, Cavities, Coupled Modes, Diamagnetism, Ion Motion, Magnetohydrodynamic Waves, Plasma Density, Solar Wind
Scientific paper
The problem of collisionless coupling between a plasma beam and a background plasma is examined using a three-dimensional hybrid code. The beam is assumed to be moving parallel to an ambient magnetic field at a speed greater than the local Alfven speed. In addition, the beam has a finite spatial extent in the directions perpendicular to the magnetic field and is uniform and infinite in the direction parallel to the ambient magnetic field. Such a system is susceptible to coupling of the beam ions with the background ions via an electromagnetic ion beam instability. This instability isotropizes the beam and energizes the background plasma. A large-amplitude Alfven wave traveling radially away from the interaction region is associated with the energized background plasma. The process described here is one which may be responsible for the formation of diamagnetic cavities observed in the solar wind.
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