Reference : Oblique propagation of electromagnetic waves in a kappa-Maxwellian plasma
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/33769
Oblique propagation of electromagnetic waves in a kappa-Maxwellian plasma
English
Cattaert, Tom [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Bioinformatique >]
Hellberg, M. A. [> > > >]
Mace, R. L. [> > > >]
2007
Physics of Plasmas
American Institute of Physics
14
8
12
Yes (verified by ORBi)
1070-664X
[en] EARTHS BOW SHOCK ; VELOCITY DISTRIBUTION ; SPACE PLASMAS ; SUPERTHERMAL ; PARTICLES ; DISPERSION FUNCTION ; LORENTZIAN DISTRIBUTION ; MAGNETIZED ; PLASMA ; SOLAR-WIND ; ELECTRONS ; DISTRIBUTIONS
[en] 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 Z(kappa M) were recently introduced to model magnetized space plasmas. The susceptibility tensor for a kappa-Maxwellian plasma component is derived, making use of Z(kappa M). 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 kappa ->infinity. As an illustration, the formalism is applied to the lower branch of the R mode and its off-parallel variant. For low kappa 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 kappa 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. (C) 2007 American Institute of Physics.
http://hdl.handle.net/2268/33769

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