Solar Magnetoseismology with Magnetoacoustic Surface Waves in Asymmetric Magnetic Slab Waveguides
Solar Magnetoseismology with Magnetoacoustic Surface Waves in Asymmetric Magnetic Slab Waveguides
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DOI：
10.3847/1538-4357/aaad0c
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
M. Allcock;R. Erdélyi
中科院分区：
文献类型：
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作者：
M. Allcock;R. Erdélyi
太阳磁震学是一种间接的方法来近似等离子体参数，这些参数在传统上很难在太阳大气中使用磁流体动力学波的观测来测量。磁板可以作为磁声波的波导，近似于太阳大气中的磁结构。在每个外部区域中由不同的等离子体参数引起的板的不对称性在板的每一侧不同地影响本征频率和本征函数，即，本征模式的传播沿着板的时间和空间轮廓都受到平衡不对称性的影响。我们提出了两种新的诊断工具，太阳磁震学，使用这种失真估计板磁场强度使用磁声表面波的空间分布：振幅比和最小扰动位移技术。他们有可能估计背景平衡参数在不均匀的太阳能结构，如细长的磁亮点，双折射，和集群的磁增亮植根于太阳黑子光桥称为光桥浪涌或光墙，这可能是局部近似为板。
Solar magnetoseismology is an indirect method to approximate plasma parameters that are traditionally difficult to measure in the solar atmosphere using observations of magnetohydrodynamic waves. A magnetic slab can act as waveguide for magnetoacoustic waves that approximates magnetic structures in the solar atmosphere. The asymmetry of the slab caused by different plasma parameters in each external region affects both the eigenfrequencies and eigenfunctions differently at each side of the slab, that is, both the temporal and spatial profiles of the eigenmodes of propagation along the slab are influenced by the equilibrium asymmetry. We present two novel diagnostic tools for solar magnetoseismology that use this distortion to estimate the slab magnetic field strength using the spatial distribution of magnetoacoustic surface waves: the amplitude ratio and the minimum perturbation shift techniques. They have the potential to estimate background equilibrium parameters in inhomogeneous solar structures such as elongated magnetic bright points, prominences, and the clusters of magnetic brightenings rooted in sunspot light bridges known as light bridge surges or light walls, which may be locally approximated as slabs.