日珥柱中的非线性快磁声波
Nonlinear Fast Magnetosonic Waves in Solar Prominence Pillars
摘要：
我们研究了日珥中非线性快磁声波（NFM）的性质，其动机是最近的高分辨率和高节奏的Hinode/SOT观测日珥柱中的小尺度振荡。作为一个例子，我们分析了2012年2月14日Hinode/SOT观测的准周期传播特征与NFM波一致的细节，在Ca~II和H_alpha的远蓝翼的发射中成像。我们进行小波分析，并发现在1-3分钟的周期范围内的振荡。在这些观测的指导下，我们用三维磁流体力学（3D MHD）模型模拟了NFM波，扩展了以前的2.5D MHD研究。新模型包括嵌入在热日冕中的突出柱的高密度，低温材料的结构，在潜在的和非力自由剪切磁场配置。非线性模型演示了模式耦合的影响和传播密度压缩与线性和NFM波。导快磁声波，连同密度压缩和电流，再现在3D柱结构。首次证明了非无力场中磁剪切引起的洛伦兹力对柱状结构和波传播的动力学效应。从三维MHD模拟中获得的见解对于改善表现出快速MHD波活动的日珥结构的冠状地震学是有用的。
英文摘要：
We investigate the properties of nonlinear fast magnetosonic (NFM) waves in a solar prominence, motivated by recent high-resolution and high-cadence Hinode/SOT observations of small-scale oscillations in a prominence pillar. As an example, we analyze the details of the 2012 February 14 Hinode/SOT observations of quasi-periodic propagating features consistent with NFM waves, imaged in emission in Ca~II and in the far blue wing of H_alpha. We perform wavelet analysis and find oscillations in the 1-3 min period range. Guided by these observations, we model the NFM waves with a three-dimensional magnetohydrodynamics (3D MHD) model, extending previous 2.5D MHD studies. The new model includes the structure of the high-density, low-temperature material of the prominence pillar embedded in the hot corona, in both potential and non-force-free sheared magnetic field configurations. The nonlinear model demonstrates the effects of mode coupling and the propagating density compressions associated with linear and NFM waves. The guided fast magnetosonic waves, together with density compressions and currents, are reproduced in the 3D pillar structure. We demonstrate or the first time the dynamic effects of the Lorentz force due to the magnetic shear in the non-force-free field on the pillar structure and on the propagation of the waves. The insights gained from the 3D MHD modeling are useful for improving coronal seismology of prominence structures that exhibit fast MHD wave activity.
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