Propagation of Surface Magnetohydrodynamic Waves in Asymmetric Multilayered Plasma
Propagation of Surface Magnetohydrodynamic Waves in Asymmetric Multilayered Plasma
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DOI：
10.3847/1538-4357/aae83c
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发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
D. Shukhobodskaia;R. Erdélyi
中科院分区：
文献类型：
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作者：
D. Shukhobodskaia;R. Erdélyi
研究不同平衡配置下的磁流体动力波传播对于太阳磁震学的发展具有重要意义。在目前的工作中，考虑了夹在任意数量的非磁性层之间的磁化等离子体板，并使用分析方法来推导其色散关系。这项工作是 Roberts 研究的对称板模型和 Allcock & Erdélyi 考虑的非对称磁板模型的自然推广。与不对称板的色散关系类似，并且与对称板不同，不对称多层等离子体的色散关系不能解耦为香肠和扭结本征模式。允许我们在多层板中传播的波具有混合特征。因此，准香肠波和准扭结波的概念更为合适。在这里，我们重点关注多层结构如何影响本征模。本征模的振幅取决于平衡结构和模型参数；这激发了作为太阳磁震学工具的应用。最后，详细研究了两层和三层板的具体情况，并讨论了它们对磁性亮点的潜在适用性。
Investigation of magnetohydrodynamic wave propagation in different equilibrium configurations is important for the development of solar magnetoseismology. In the present work, a magnetized plasma slab sandwiched between an arbitrary number of nonmagnetic layers is considered and an analytical approach is used for the derivation of its dispersion relation. This work is a natural generalization of the symmetric slab model studied by Roberts and the asymmetric magnetic slab model, considered by Allcock & Erdélyi. Similar to the dispersion relation for an asymmetric slab, and unlike a symmetric slab, the dispersion relation for an asymmetric multilayered plasma cannot be decoupled into sausage and kink eigenmodes. The waves that permitted us to propagate in multilayered slabs have mixed characters; therefore, the notion of quasi-sausage and quasi-kink waves is more appropriate. Here, we focus on how a multilayered structuring affects the eigenmodes. The amplitudes of the eigenmodes depend on the equilibrium structuring and the model parameters; this motivates an application as a solar magnetoseismology tool. Finally, specific cases of two- and three-layered slabs are studied in detail and their potential applicability to magnetic bright points is discussed.