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arXiv 1008.2131astro-ph.SR
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太阳黑子内半影区的电流密度矢量

The electrical current density vector in the inner penumbra of a Sunspot

K. G. Puschmann, B. Ruiz Cobo, V. Martínez Pillet

摘要:

我们确定了整个电流密度矢量的太阳黑子的内半影的几何3D体积从与日出/SP获得的光谱偏振数据的反演。显着的电流被认为是包裹在较热,更高的地区,更低,更水平的磁场,港口强大的上升流和径向流出(intraspines)。电流密度矢量的水平分量比垂直分量大3-4倍;几乎所有以前的研究都只得到垂直分量,因此大大低估了电流密度。电流密度和磁场矢量形成大约20度的角度。等离子体β在0公里的水平是大于1的intraspines,是一个数量级的半影(脊)的背景成分低。在200公里的水平上,几乎所有地方的等离子体β都低于0.3。等离子体β表面以及表面光学深度单位是非常波纹的。在脊柱内和内部的边界处,磁场在较深的层处不是无力的,而在顶层处几乎是无力的。脊椎的磁场几乎是到处都有电势。耗散的欧姆能量比太阳能通量小五个数量级,因此对于半影的能量平衡可以忽略不计。

英文摘要:

We determine the entire electrical current density vector in a geometrical 3D volume of the inner penumbra of a sunspot from an inversion of spectropolarimetric data obtained with Hinode/SP. Significant currents are seen to wrap around the hotter, more elevated regions with lower and more horizontal magnetic field that harbor strong upflows and radial outflows (the intraspines). The horizontal component of the current density vector is 3-4 times larger than the vertical; nearly all previous studies only obtain the vertical component and thus strongly underestimate the current density. The current density and the magnetic field vectors form an angle of about 20 degrees. The plasma beta at the 0 km level is larger than 1 in the intraspines and is one order of magnitude lower in the background component of the penumbra (spines). At the 200 km level, the plasma beta is below 0.3 nearly everywhere. The plasma beta surface as well as the surface optical depth unity are very corrugated. At the borders of intraspines and inside, the magnetic field is not force-free at deeper layers and nearly force free at the top layers. The magnetic field of the spines is close to being potential everywhere. The dissipated ohmic energy is five orders of magnitudes smaller than the solar energy flux and thus negligible for the energy balance of the penumbra.

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