Waves in cosmic magnetic structures taking into account the anisotropic plasma pressure
Waves in cosmic magnetic structures taking into account the anisotropic plasma pressure
复制标题
考虑各向异性等离子体压力的宇宙磁结构中的波
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
V. Oraevsky
中科院分区：
文献类型：
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作者：
V. Nakariakov;V. Oraevsky
本文基于Chew-Goldberger-Low近似，分析了等离子体动压沿磁场和跨磁场不同的情况下，磁声本征波在磁等离子体结构中的传播。各向异性不会导致新模式的出现。研究了被单个磁面捕获的波的相速度与压力各向异性的关系。对于无磁场环境下的磁性板，得到了本征波的色散关系。压力各向异性会显著改变这种模式的色散关系。特别是，在强各向异性的情况下，后向波是可能的。得到了反射镜和软管不稳定性的阈值与系统参数的关系。特别是，对于某些波数区域，这种波的软管不稳定性和镜面不稳定性是不存在的。利用这些结果得到了日冕环和色球通量管中的本征波特性。
This paper provides an analysis of magneto-sonic eigenwaves travelling in magnetic plasma structures based on the Chew-Goldberger-Low approximation, for which the plasma kinetic pressure is different along and across the magnetic field. The anisotropy does not lead to the emergence of new modes. The dependence of phase velocities of the waves, trapped by a single magnetic surface, on the pressure anisotropy is investigated. For a magnetic slab with field-free surroundings, the dispersion relations for the eigenwaves are obtained. The pressure anisotropy may change dispersion relations of such modes significantly. In particular, backward waves are possible in the case of strong anisotropy. The dependences of the thresholds for the mirror and hose instabilities on the system parameters are obtained. In particular, hose and mirror instabilities of such waves are absent for some wave number regions. The results are used to obtain the eigenwave characteristics in coronal loops and chromospheric flux tubes.