Nonlinear Instability of Kink Oscillations due to Shear Motions
Nonlinear Instability of Kink Oscillations due to Shear Motions
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DOI：
10.1086/593203
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
J. Terradas;J. Andries;J. Andries;Marcel Goossens;I. Arregui;R. Oliver;J. Ballester
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文献类型：
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作者：
J. Terradas;J. Andries;J. Andries;Marcel Goossens;I. Arregui;R. Oliver;J. Ballester
提出了扭结振荡高分辨率三维非线性数值研究的第一个结果。我们详细展示了非扭转线系磁通管中剪切不稳定性的发展。这种不稳定性会导致管边界产生显着的变形。由于通量管和外部介质之间的急剧过渡处的剪切不稳定性，可能会自然地形成扩展的过渡层。我们还讨论了当模型中包含不均匀层时，不稳定性对共振吸收过程可能产生的影响。这些结果的含义之一是，防止剪切不稳定性所需的日冕稳定通量管的磁场方位角分量可能被限制在一个非常特定的范围内。
First results from a high-resolution three-dimensional nonlinear numerical study of the kink oscillation are presented. We show in detail the development of a shear instability in an untwisted line-tied magnetic flux tube. The instability produces significant deformations of the tube boundary. An extended transition layer may naturally evolve as a result of the shear instability at a sharp transition between the flux tube and the external medium. We also discuss the possible effects of the instability on the process of resonant absorption when an inhomogeneous layer is included in the model. One of the implications of these results is that the azimuthal component of the magnetic field of a stable flux tube in the solar corona, needed to prevent the shear instability, is probably constrained to be in a very specific range.