Excitation of large-amplitude Alfv{acute e}n waves in a nonrelativistic electron{endash}positron plasma with a temperature anisotropy T{sub {perpendicular}}{gt}T{sub {parallel}}
- Department of Electronics and Information, Toyama University, Toyama, 930 (Japan)
- Danish Meteorological Institute, Copenhagen (Denmark)
Excitation of large-amplitude Alfv{acute e}n waves in an anisotropic electron{endash}positron plasma is investigated with a two-and-one-half-dimensional (2(1)/(2)-D), electromagnetic particle code. If the plasma distribution is a bi-Maxwellian with T{sub {perpendicular}}/T{sub {parallel}}{gt}1, where the subscript symbols denote directions perpendicular and parallel to the ambient magnetic field, Alfv{acute e}n waves with arbitrary polarization are generated. Simulations show that the amplitude of the waves increases both with increasing temperature anisotropy and parallel plasma {beta}{sub {parallel}}. The stabilization of individual wave modes occurs sequentially, from higher values of wave number down to lower ones, in the evolution of the temperature anisotropy instability. Wave{endash}particle scattering by the enhanced waves maintains the initially bi-Maxwellian character throughout the simulation, even as it reduces T{sub {perpendicular}} and increases T{sub {parallel}}. After saturation of wave magnetic energy a large residual temperature anisotropy still remains and persists through the end of the simulation. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 542591
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 10 Vol. 4; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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