Magnetic buoyancy instabilities for a static plane layer
Magnetic buoyancy instabilities for a static plane layer
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静态平面层的磁浮力不稳定性
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
D. Hughes
中科院分区：
文献类型：
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作者：
D. Hughes
最近的计算表明，太阳磁场的大部分可能存储在一个薄的对流稳定区之间的对流区本身和辐射区。因此，确定这种场的稳定性对于磁通量的产生和逃逸都具有重要意义。磁Boussinesq方程用于执行静态平面层的线性稳定性分析。揭示了几种新的不稳定机制，表明以前关于磁浮力不稳定性的想法过于简化。最重要的结果是，甚至对于随高度增加的场，也可能发生不稳定性。本文给出了弱分层磁场二维和三维运动的详细结果，并对强变化磁场的二维不稳定性作了简单计算。
Abstract Recent calculations suggest that the bulk of the solar magnetic field may be stored in a thin convectively stable region situated between the convection zone proper and the radiative zone. Determining the stability properties of such a field is therefore important with implications for both the generation and escape of magnetic flux. The magneto-Boussinesq equations are used to perform a linear stability analysis of a static plane layer. Several new instability mechanisms are revealed showing previous ideas concerning magnetic buoyancy instabilities to be over simplified. The most important result is that instability may occur even for fields which increase with height. Detailed results are presented for 2 and 3 dimensional motions for a weakly stratified magnetic field together with a simple calculation for the 2 dimensional instability of a strongly varying field.