The Electron Firehose and Ordinary-Mode Instabilities in Space Plasmas
نویسندگان
چکیده
منابع مشابه
Firehose instability in space plasmas with bi-kappa distributions
Context. The existence of suprathermal charged particle populations in space plasma is frequently confirmed by interplanetary missions. In general, the velocity distribution functions are anisotropic, field aligned (gyrotropic) with two temperatures, parallel (T‖) and perpendicular (T⊥) to the ambient magnetic field B0. Aims. Here, the dispersion properties of the firehose instability, which re...
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We investigate the nature of the heliosheath plasma behind the Termination Shock across which jump relations in anisotropic MHD are formulated. Along side analytical results for downstream parameters in the strictly parallel and perpendicular cases we numerically solve the Rankine-Hugoniot relations for arbitrary shock angle and strength. We then focus on two temperature anisotropy driven insta...
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The isotropization process of a collisionless plasma with an electron temperature anisotropy along an external magnetic field (T e ‖ ≫ T e ⊥, ‖ and ⊥ with respect to the background magnetic field) and isotropic protons is investigated using a particle-in-cell (PIC) code. Restricting wave growth mainly parallel to the external magnetic field, the isotropization mechanism is identified to be the ...
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In turbulent high-beta astrophysical plasmas (exemplified by the galaxy cluster plasmas), pressure-anisotropy-driven firehose and mirror fluctuations grow nonlinearly to large amplitudes, deltaB/B approximately 1, on a time scale comparable to the turnover time of the turbulent motions. The principle of their nonlinear evolution is to generate secularly growing small-scale magnetic fluctuations...
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ژورنال
عنوان ژورنال: Solar Physics
سال: 2013
ISSN: 0038-0938,1573-093X
DOI: 10.1007/s11207-013-0348-y