Localized plumes in three-dimensional compressible magnetoconvection Localized plumes in magnetoconvection
Localized plumes in three-dimensional compressible magnetoconvection Localized plumes in magnetoconvection
复制标题
三维可压缩磁对流中的局部羽流 磁对流中的局部羽流
DOI：
10.1111/j.1365-2966.2010.17926.x
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发表时间：
2011
影响因子：
4.8
通讯作者：
Houghton S
中科院分区：
文献类型：
--
作者：
Houghton S
在太阳黑子的本影内，对流通常会因强垂直磁场的存在而受到抑制。然而，这些区域的对流并未完全受到抑制：明亮的特征（称为本影点）可能与微弱、孤立的对流羽流有关。受本影点观察的启发，我们对三维可压缩磁对流进行了数值模拟。通过将解分支到亚临界参数状态（参数空间的一个区域，其中静态解对于对流扰动是线性稳定的），我们发现可以生成一个以单个孤立的对流羽流为特征的解。该解决方案类似于先前在二维计算中发现的稳定磁流体动力对流。从定性意义上讲，这些结果可以与本影点的观察相关。
Within the umbrae of sunspots, convection is generally inhibited by the presence of strong vertical magnetic fields. However, convection is not completely suppressed in these regions: bright features, known as umbral dots, are probably associated with weak, isolated convective plumes. Motivated by observations of umbral dots, we carry out numerical simulations of three-dimensional, compressible magnetoconvection. By following solution branches into the subcritical parameter regime (a region of parameter space in which the static solution is linearly stable to convective perturbations), we find that it is possible to generate a solution which is characterized by a single, isolated convective plume. This solution is analogous to the steady magnetohydrodynamic convectons that have previously been found in two-dimensional calculations. These results can be related, in a qualitative sense, to observations of umbral dots.