Magnetic field intensification by three-dimensional explosion process
Magnetic field intensification by three-dimensional explosion process
复制标题
三维爆炸过程增强磁场
DOI：
10.1088/2041-8205/759/1/l24
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and T. Yokoyama
中科院分区：
文献类型：
--
作者：
H. Hotta;M. Reropel;and T. Yokoyama
我们研究了一种不依赖于差异旋转的太阳对流区底部附近磁场的增强机制。这种机制，除了差动旋转已提出的磁通量出现的研究，这通常需要超过那些由差动旋转单独提供的场强。本文研究了超磁层结对流区的势能转化为磁能的过程。这种机制，被称为“爆炸的磁通量管”，以前已经研究了薄通量管近似以及二维磁流体动力学（MHD）模拟，在这里，我们扩大调查的三维MHD模拟。我们的主要结果是，可以实现足够的强化在一个三维的磁通量片，只要施加的扰动垂直于磁场的空间尺度足够大。当这个空间尺度很小时，通量片倾向于向表面上升，导致磁场放大的显着降低。
We investigate an intensification mechanism for the magnetic field near the base of the solar convection zone that does not rely on differential rotation. Such mechanism in addition to differential rotation has been suggested by studies of flux emergence, which typically require field strength in excess of those provided by differential rotation alone. We study here a process in which potential energy of the superadiabatically stratified convection zone is converted into magnetic energy. This mechanism, known as the" explosion of magnetic flux tubes," has been previously studied in thin flux tube approximation as well as two-dimensional magnetohydrodynamic (MHD) simulations; here we expand the investigation to three-dimensional MHD simulations. Our main result is that enough intensification can be achieved in a three-dimensional magnetic flux sheet as long as the spatial scale of the imposed perturbation normal to the magnetic field is sufficiently large. When this spatial scale is small, the flux sheet tends to rise toward the surface, resulting in a significant decrease of the magnetic field amplification.