Wave Instabilities of a Collisionless Plasma in Fluid Approximation
Wave Instabilities of a Collisionless Plasma in Fluid Approximation
复制标题
DOI：
10.1002/ctpp.201000089
复制
发表时间：
2009-11
影响因子：
1.6
通讯作者：
N. S. Dzhalilov;V. D. Kuznetsov;J. S. A. I. Potsdam;Germany;Pushkov Institute of Terrestrial Magnetism;Ionosphere;R. Propagation;TroitskMoscow;Russia;Shamakhy Astrophysical Observatory;Baku;Azerbaidjan
中科院分区：
文献类型：
--
作者：
N. S. Dzhalilov;V. D. Kuznetsov;J. S. A. I. Potsdam;Germany;Pushkov Institute of Terrestrial Magnetism;Ionosphere;R. Propagation;TroitskMoscow;Russia;Shamakhy Astrophysical Observatory;Baku;Azerbaidjan
利用从Vlasov方程得到的输运方程的16阶矩组，研究了流体近似下磁化、各向异性、无碰撞、稀薄热等离子体中的波动性质和不稳定性。这些方程与CGL-MHD流体模型（Chew，Goldberger和Low [5，9]的单流体方程）的不同之处在于包括两个各向异性热通量演化方程，其中通量使双重多方CGL定律无效。导出了线性可压缩波模的一般色散关系。除了经典的不可压缩消防水龙带模式，出现了四种类型的可压缩波模式：两个快速和慢速镜像模式-强烈修改相比，CGL模型-和两个热模式。在初始热通量沿着磁场的存在下，对于相对于磁场向前和向后运行的波，波的性质变得不同。CGL-MHD流体模型的结果和动力学理论的结果之间众所周知的差异现在被消除了：i）镜像慢模不稳定性标准现在与动力学理论中的标准相同。ii）类似地，在动力学研究中，出现了两种消防水带不稳定性-不可压缩的和可压缩的。这两种不稳定性可以出现相同的等离子体参数，和新的可压缩的倾斜消防水龙带模式的不稳定性可以成为主导。可压缩消防水龙带不稳定性是三个逆行模式-两个热模式和一个快速镜像模式的共振耦合的结果。结果可以应用于太阳和恒星日冕和风模型的理论（© 2011 WILEY-VCH Verlag GmbH & Co. KGaA，魏因海姆）
Wave properties and instabilities in a magnetized, anisotropic, collisionless, rarefied hot plasma in fluid approx‐imation are studied, using the 16‐moments set of the transport equations obtained from the Vlasov equations. These equations differ from the CGL‐MHD fluid model (single fluid equations by Chew, Goldberger, and Low [5,9]) by including two anisotropic heat flux evolution equations, where the fluxes invalidate the double polytropic CGL laws. We derived the general dispersion relation for linear compressible wave modes. Besides the classic incompressible fire hose modes there appear four types of compressible wave modes: two fast and slow mirror modes – strongly modified compared to the CGL model – and two thermal modes. In the presence of initial heat fluxes along the magnetic field the wave properties become different for the waves running forward and backward with respect to the magnetic field. The well known discrepancies between the results of the CGL‐MHD fluid model and the kinetic theory are now removed: i) The mirror slow mode instability criterion is now the same as that in the kinetic theory. ii) Similarly, in kinetic studies there appear two kinds of fire hose instabilities ‐ incompressible and compressible ones. These two instabilities can arise for the same plasma parameters, and the instability of the new compressible oblique fire hose modes can become dominant. The compressible fire hose instability is the result of the resonance coupling of three retrograde modes ‐ two thermal modes and a fast mirror mode. The results can be applied to the theory of solar and stellar coronal and wind models (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)