FREQUENCY FILTERING OF TORSIONAL ALFVÉN WAVES BY CHROMOSPHERIC MAGNETIC FIELD
FREQUENCY FILTERING OF TORSIONAL ALFVÉN WAVES BY CHROMOSPHERIC MAGNETIC FIELD
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DOI：
10.1088/2041-8205/740/2/l46
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发表时间：
2011-10
期刊：
影响因子：
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通讯作者：
V. Fedun;G. Verth;D. Jess;R. Erdélyi
中科院分区：
文献类型：
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作者：
V. Fedun;G. Verth;D. Jess;R. Erdélyi
在这封信中，我们演示了如何在色球磁通管中观察宽带频率传播的扭转阿尔文波，可以提供有价值的洞察其磁场结构。通过实施一个完整的非线性三维磁流体动力学数值模拟与现实的涡流驱动器，我们演示了如何色球磁通管的等离子体结构可以作为一个空间依赖的频率滤波器的扭转阿尔文波。重要的是，对于太阳磁震学应用，发现这种频率滤波强烈依赖于磁场结构。参考一个使用瑞典太阳望远镜光谱数据传播扭转阿尔文波的观测案例研究，我们演示了观察到的最大功率傅立叶频率的二维空间分布与我们的前向模型有很强的相关性。这开启了一个色球磁震学时代的可能性，以补充绘制太阳色球磁场结构的传统方法。
In this Letter, we demonstrate how the observation of broadband frequency propagating torsional Alfvén waves in chromospheric magnetic flux tubes can provide valuable insight into their magnetic field structure. By implementing a full nonlinear three-dimensional magnetohydrodynamic numerical simulation with a realistic vortex driver, we demonstrate how the plasma structure of chromospheric magnetic flux tubes can act as a spatially dependent frequency filter for torsional Alfvén waves. Importantly, for solar magnetoseismology applications, this frequency filtering is found to be strongly dependent on magnetic field structure. With reference to an observational case study of propagating torsional Alfvén waves using spectroscopic data from the Swedish Solar Telescope, we demonstrate how the observed two-dimensional spatial distribution of maximum power Fourier frequency shows a strong correlation with our forward model. This opens the possibility of beginning an era of chromospheric magnetoseismology, to complement the more traditional methods of mapping the magnetic field structure of the solar chromosphere.