期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 401, 期 1, 页码 362-370出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15647.x
关键词
plasmas; waves; methods: analytical
资金
- Research Foundation Flanders - FWO Belgium
- Katholieke Universiteit Leuven [F/07/061]
- Deutsche Forschungsgemeinschaft [Schl 201/17-1]
- European Commission [MTRN-CT-2006-035484]
- SOTERIA [218816]
- [GOA/2009-009]
- [G.0304.07]
- [C 90347]
The analysis of the stability and the dispersion properties of a counterstreaming plasma system with kappa distributions are extended here with the investigation of perpendicular instabilities. Purely growing filamentation (Weibel-like) modes propagating perpendicular to the background magnetic field can be excited in streaming plasmas with or without an excess of parallel temperature. In this case, however, the effect of suprathermal tails of kappa populations is opposite to that obtained for parallel waves: the growth rates can be higher and the instability faster than for Maxwellian plasmas. The unstable wavenumbers also extend to a markedly larger broadband making this instability more likely to occur in space plasmas with anisotropic distributions of kappa-type. The filamentation instability of counterstreaming magnetized plasmas could provide a plausible mechanism for the origin of two-dimensional transverse magnetic fluctuations detected at different altitudes in the solar wind.
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