MHD waves generated by high-frequency photospheric vortex motions
MHD waves generated by high-frequency photospheric vortex motions
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DOI：
10.5194/angeo-29-1029-2011
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发表时间：
2011-01-01
影响因子：
1.9
通讯作者：
Erdelyi, R.
中科院分区：
文献类型：
--
作者：
Fedun, V.;Shelyag, S.;Erdelyi, R.
本文讨论了太阳低层大气中MHD波产生和通过三维开放磁通量管传播的数值模拟。利用笛卡尔坐标系中磁场的自相似解析解，构造了一个三维磁流体静力学位形，作为非线性MHD波模拟的初始条件。对于一个驱动程序，我们已经实现了一个高频涡流型运动在开放的磁通量管的足点区域。结果发现，实现的漩涡源是能够激发不同类型的波模式，即香肠，扭结和扭转阿尔芬模式。通过磁震学工具分析这些波可以深入了解太阳低层大气的磁结构。
In this paper, we discuss simulations of MHD wave generation and propagation through a three-dimensional open magnetic flux tube in the lower solar atmosphere. By using self-similar analytical solutions for modelling the magnetic field in Cartesian coordinate system, we have constructed a 3-D magnetohydrostatic configuration which is used as the initial condition for non-linear MHD wave simulations. For a driver we have implemented a high-frequency vortex-type motion at the footpoint region of the open magnetic flux tube. It is found that the implemented swirly source is able to excite different types of wave modes, i.e. sausage, kink and torsional Alfven modes. Analysing these waves by magneto-seismology tools could provide insight into the magnetic structure of the lower solar atmosphere.