层结等温大气模式转换的新认识
A New Look at Mode Conversion in a Stratified Isothermal Atmosphere
摘要：
日冕磁零点附近波传播的最新数值研究（McLaughlin和Hood：Astron. Astrophys. 459，641，2006）已经指出，当扰动从低β等离子体传递到高β等离子体时，快MHD波如何部分地转换成慢MHD波。这是一个复杂的过程，要清楚地了解转换机制，需要对一个更简单的模型进行详细的研究。本文用数值方法和解析方法研究了在均匀垂直磁场作用下的分层等温大气中的模式转换。与以前对向上传播波的研究相反（Zhugzhda和Dzhalilov：Astron. Astrophys. 112，16，1982 a; Cally：Astrophys. J. 548，473，2001），本文研究了波从低β到高β环境的向下传播。一个简单的表达式的透射波的振幅进行了比较的数值解。
英文摘要：
Recent numerical investigations of wave propagation near coronal magnetic null points (McLaughlin and Hood: Astron. Astrophys. 459, 641,2006) have indicated how a fast MHD wave partially converts into a slow MHD wave as the disturbance passes from a low-beta plasma to a high-beta plasma. This is a complex process and a clear understanding of the conversion mechanism requires the detailed investigation of a simpler model. An investigation of mode conversion in a stratified, isothermal atmosphere, with a uniform, vertical magnetic field is carried out, both numerically and analytically. In contrast to previous investigations of upward-propagating waves (Zhugzhda and Dzhalilov: Astron. Astrophys. 112, 16, 1982a; Cally: Astrophys. J. 548, 473, 2001), this paper studies the downward propagation of waves from a low-beta to high-beta environment. A simple expression for the amplitude of the transmitted wave is compared with the numerical solution.
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