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arXiv 1309.2019astro-ph.SR
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太阳光球涡旋模拟中的阿尔文波

Alfvén waves in simulations of solar photospheric vortices

S. Shelyag, P. S. Cally, A. Reid, M. Mathioudakis

摘要:

使用先进的磁流体动力学数值模拟的磁化太阳光球,包括非灰色辐射传输和非理想状态方程,我们分析等离子体运动光球磁涡。我们证明,光球磁场浓度中明显的涡旋状运动不会表现出“龙卷风”般的行为或“浴缸”效应。虽然在每一个时刻,在太阳光球上层的速度场线显示漩涡,与时间相关的速度场运动的测试粒子没有表现出这样的结构。相反,它们以波浪状的方式移动,速度场迅速变化和振荡,主要由磁化晶间向下流动的磁张力决定。使用时间-距离图,我们确定在磁通量管的水平运动作为扭转阿尔文扰动传播沿近垂直的磁场线与当地阿尔文速度。

英文摘要:

Using advanced numerical magneto-hydrodynamic simulations of the magnetised solar photosphere, including non-grey radiative transport and a non-ideal equation of state, we analyse plasma motions in photospheric magnetic vortices. We demonstrate that apparent vortex-like motions in photospheric magnetic field concentrations do not exhibit "tornado"-like behaviour or a "bath-tub" effect. While at each time instance the velocity field lines in the upper layers of the solar photosphere show swirls, the test particles moving with the time-dependent velocity field do not demonstrate such structures. Instead, they move in a wave-like fashion with rapidly changing and oscillating velocity field, determined mainly by magnetic tension in the magnetised intergranular downflows. Using time-distance diagrams, we identify horizontal motions in the magnetic flux tubes as torsional Alfvén perturbations propagating along the nearly vertical magnetic field lines with local Alfvén speed.

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