谱斑区与宁静太阳中瞬态水平磁场的比较
Comparison of transient horizontal magnetic fields in a plage region and in the quiet Sun
摘要：
得到了太阳平斑区和宁静区的瞬态水平磁场（THMF）的特性，并进行了比较。利用日之出卫星上的太阳光学望远镜（SOT）对位于盘中心附近的斑区和平静区进行了大约30秒的分光偏振观测。我们选择具有净线极化（LP）高于0.22%、面积大于或等于3像素的THMF，并比较它们的出现率和磁场方位角分布。我们得到了这两个区域的磁场强度和倾角的概率密度函数（PDF），谱斑区的出现率与宁静太阳的出现率相同。谱斑区域的垂直磁通量比宁静太阳的大8倍。在任一区域中，THMF基本上没有优选取向。然而，在具有较高LP的谱斑区域中，THMF具有与谱斑区域的大尺度垂直场图案一致的优选方向。PDF表明，当我们避免了持续的大垂直通量浓度的斑区，平静的太阳和斑区之间的水平场的场强分布没有差异。的相似性的PDF和发生率在plage和安静的地区表明，由于颗粒运动的本地发电机过程可能会产生THMF整个太阳。在谱斑中更高LP的优选取向表明THMF在某种程度上受到谱斑的大尺度磁场图案的影响。
英文摘要：
Properties of transient horizontal magnetic fields (THMFs) in both plage and quiet Sun regions are obtained and compared. Spectro-polarimetric observations with the Solar Optical Telescope (SOT) on the Hinode satellite were carried out with a cadence of about 30 seconds for both plage and quiet regions located near disk center. We select THMFs that have net linear polarization (LP) higher than 0.22%, and an area larger than or equal to 3 pixels, and compare their occurrence rates and distribution of magnetic field azimuth. We obtain probability density functions (PDFs) of magnetic field strength and inclination for both regions.The occurrence rate in the plage region is the same as for the quiet Sun. The vertical magnetic flux in the plage region is ~8 times larger than in the quiet Sun. There is essentially no preferred orientation for the THMFs in either region. However, THMFs in the plage region with higher LP have a preferred direction consistent with that of the plage-region's large-scale vertical field pattern. PDFs show that there is no difference in the distribution of field strength of horizontal fields between the quiet Sun and the plage regions when we avoid the persistent large vertical flux concentrations for the plage region. The similarity of the PDFs and of the occurrence rates in plage and quiet regions suggests that a local dynamo process due to the granular motion may generate THMFs all over the sun. The preferred orientation for higher LP in the plage indicates that the THMFs are somewhat influenced by the larger-scale magnetic field pattern of the plage.
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