太阳型恒星中引力-阿尔芬波的过反射和产生
On over-reflection and generation of Gravito-Alfven waves in solar-type stars
摘要：
本文研究了具有恒定剪切率和重力诱导层结的磁化等离子体剪切流中线性扰动的动力学。一般的线性化方程组推导和二维情况下被认为是详细的。Boussinesq近似用于研究低频模式的相对小尺度扰动：引力-阿尔芬波（GAW）和熵模式（EM）扰动。结果表明，对于任意剪切率的流动，存在一个有限时间间隔的非绝热扰动演化。非绝热行为表现在两个方面，即通过GAW的过反射和通过从EM扰动生成GAW。结果表明，这些现象作为有效的Transformers器的平衡流的能量到扰动的能量为中等和高剪切率的太阳等离子体流。通过EM的GAW的有效生成发生剪切速率约一个数量级小于发展的剪切不稳定性所需的。后一个事实可能对太阳和类太阳恒星的角动量再分配问题产生重要影响。
英文摘要：
The dynamics of linear perturbations is studied in magnetized plasma shear flows with a constant shearing rate and with gravity-induced stratification. The general set of linearized equations is derived and the two-dimensional case is considered in detail. The Boussinesq approximation is used in order to examine relatively small-scale perturbations of low-frequency modes: Gravito-Alfven waves (GAW) and Entropy Mode (EM) perturbations. It is shown that for flows with arbitrary shearing rate there exists a finite time interval of non-adiabatic evolution of the perturbations. The non-adiabatic behavior manifests itself in a twofold way, viz. by the over-reflection of the GAWs and by the generation of GAWs from EM perturbations. It is shown that these phenomena act as efficient transformers of the equilibrium flow energy into the energy of the perturbations for moderate and high shearing rate solar plasma flows. Efficient generation of GAW by EM takes place for shearing rates about an order of magnitude smaller than necessary for development of a shear instability. The latter fact could have important consequences for the problem of angular momentum redistribution within the Sun and solar-type stars.
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