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- Tom Cattaert
- Universiteit Gent Vakgroep Toegepaste Fysica, , Jozef Plateaustraat 22, B-9000 Gent, Belgium
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- Manfred A. Hellberg
- University of KwaZulu-Natal School of Physics, , Private Bag X54001, Durban 4000, South Africa
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- Richard L. Mace
- University of KwaZulu-Natal School of Physics, , Private Bag X54001, Durban 4000, South Africa
説明
<jats:p>Space plasmas are often observed to contain more particles in the high-energy tail than the usual Maxwellian distributions, and are well modeled by kappa distributions. The hybrid kappa-Maxwellian distribution and associated generalized plasma dispersion function ZκM were recently introduced to model magnetized space plasmas. The susceptibility tensor for a kappa-Maxwellian plasma component is derived, making use of ZκM. This enables one to make general studies of obliquely propagating electromagnetic waves in a magnetoplasma. The susceptibility and dielectric tensors reduce to the Maxwellian expressions in the limit κ→∞. As an illustration, the formalism is applied to the lower branch of the R mode and its off-parallel variant. For low κ values, low-wavenumber, low-frequency parallel whistler waves are shown to be stable, unlike the Maxwellian case, which is unstable if the perpendicular temperature exceeds the parallel temperature. A numerical study is made of the effects of the value of kappa, the propagation angle, and the temperature anisotropy ratio on dispersion and damping. The kappa-Maxwellian distribution with very low κ is found to be unstable in an overdense plasma near the electron-cyclotron frequency even when the parallel and perpendicular temperatures are equal, because of the anisotropy of the contours in velocity space.</jats:p>
収録刊行物
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- Physics of Plasmas
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Physics of Plasmas 14 (8), 2007-08-01
AIP Publishing
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キーワード
詳細情報 詳細情報について
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- CRID
- 1363951793723060224
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- ISSN
- 10897674
- 1070664X
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- データソース種別
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- Crossref