太阳黑子精细结构的磁张力
Magnetic Tension of Sunspot Fine Structures
摘要：
太阳黑子的平衡结构主要取决于它的磁拓扑结构，并受磁力的支配。张力是洛伦兹力的一个分量，其在无力配置中平衡磁压力梯度。我们采用张力项的洛伦兹力，以澄清结构的太阳黑子功能，如半影细丝，本影光桥和外部半影精细结构。计算了2007年1月5日和2006年12月12日观测到的NOAA AR 10933和NOAA AR 10930两个活动区的洛伦兹力张力项的垂直分量。前者是一个简单的活性区，而后者是一个复杂的活性区，具有高度剪切的极性反转线（PIL）。使用的矢量磁图从Hinode（SOT/SP）获得。我们发现一个不均匀的分布与积极和消极的迹象，在各种功能的太阳黑子的张力。在较低场强和较高倾角的位置存在正张力与半影结构的未梳模型是一致的。在阴影光桥中也可以看到正张力，这可能是光桥结构未梳理的指示。同样，半影中与两极区域相关的向上张力可能直接证实了半影结构的海蛇模型。在AR 10930的PIL向上指向的张力似乎与通量出现有关。在某些地方，张力的大小大于重力，这意味着这些太阳黑子特征的配置几乎没有力。从我们的研究，磁张力出现作为一个有用的诊断的局部平衡的太阳黑子精细结构。
英文摘要：
The equilibrium structure of sunspots depends critically on its magnetic topology and is dominated by magnetic forces. Tension force is one component of the Lorentz force which balances the gradient of magnetic pressure in force-free configurations. We employ the tension term of the Lorentz force to clarify the structure of sunspot features like penumbral filaments, umbral light bridges and outer penumbral fine structures. We compute vertical component of tension term of Lorentz force over two active regions namely NOAA AR 10933 and NOAA AR 10930 observed on 05 January 2007 and 12 December 2006 respectively. The former is a simple while latter is a complex active region with highly sheared polarity inversion line (PIL). The vector magnetograms used are obtained from Hinode(SOT/SP). We find an inhomogeneous distribution of tension with both positive and negative signs in various features of the sunspots. The existence of positive tension at locations of lower field strength and higher inclination is compatible with the uncombed model of the penumbral structure. Positive tension is also seen in umbral light bridges which could be indication of uncombed structure of the light bridge. Likewise, the upward directed tension associated with bipolar regions in the penumbra could be a direct confirmation of the sea serpent model of penumbral structures. Upward directed tension at the PIL of AR 10930 seems to be related to flux emergence. The magnitude of the tension force is greater than the force of gravity in some places, implying a nearly force-free configuration for these sunspot features. From our study, magnetic tension emerges as a useful diagnostic of the local equilibrium of the sunspot fine structures.
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