斜传播的太阳冕板中的共振阻尼表面和体MHD波
Resonantly damped surface and body MHD waves in a solar coronal slab with oblique propagation
摘要：
在零- $β$组态和波平行传播的太阳冕板中的磁流体力学（MHD）波理论不允许表面波的存在。当考虑扰动的斜向传播时，表面波和体波都能传播。当垂直波数大于一定值时，体扭结模变为表面波。此外，香肠表面模式被发现低于内部截止频率。当包括平衡中的非均匀性时，由于共振吸收，表面和体模被阻尼。本文首先进行了简正模态分析，得到了本征函数的周期、阻尼率和空间结构。然后，时间相关的问题得到解决，并在何种条件下的一种或另一种类型的模式被激发的调查。
英文摘要：
The theory of magnetohydrodynamic (MHD) waves in solar coronal slabs in a zero-$β$ configuration and for parallel propagation of waves does not allow the existence of surface waves. When oblique propagation of perturbations is considered both surface and body waves are able to propagate. When the perpendicular wave number is larger than a certain value, the body kink mode becomes a surface wave. In addition, a sausage surface mode is found below the internal cut-off frequency. When non-uniformity in the equilibrium is included, surface and body modes are damped due to resonant absorption. In this paper, first, a normal-mode analysis is performed and the period, the damping rate, and the spatial structure of eigenfunctions are obtained. Then, the time-dependent problem is solved, and the conditions under which one or the other type of mode is excited are investigated.
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