Determination of the Topology Skeleton of Magnetic Fields in a Solar Active Region

Hui Zhao, Jingxiu Wang, Jun Zhang, C. Xiao, Haimin Wang
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引用次数: 25

Abstract

Magnetic topology has been a key to the understanding of magnetic energy release mechanism. Based on observed vector magnetograms, we have determined the three-dimensional (3D) topology skeleton of the magnetic fields in the active region NOAA 10720. The skeleton consists of six 3D magnetic nulls and a network of corresponding spines, fans, and null-null lines. For the first time, we have identified a spiral magnetic null in Sun's corona. The magnetic lines of force twisted around the spine of the null, forming a `magnetic wreath' with excess of free magnetic energy and resembling observed brightening structures at extra-ultraviolet (EUV) wavebands. We found clear evidence of topology eruptions which are referred to as catastrophic changes of topology skeleton associated with a coronal mass ejection (CME) and an explosive X-ray flare. These results shed new lights on the structural complexity and its role in explosive magnetic activity. The concept of flux rope has been widely used in modelling explosive magnetic activity, although their observational identity is rather obscure or, at least, lacking of necessary details up to date. We suggest that the magnetic wreath associated with the 3D spiral null is likely an important class of the physical entity of flux ropes.
太阳活动区磁场拓扑骨架的确定
磁拓扑结构是理解磁能释放机理的关键。基于观测到的矢量磁图,确定了活跃区NOAA 10720磁场的三维拓扑骨架。骨架由六个三维磁零和相应的脊柱,风扇和零-零线的网络组成。我们首次在太阳日冕中发现了一个螺旋磁零。磁力线绕着空脊扭曲,形成了一个“磁环”,具有多余的自由磁能,类似于在超紫外(EUV)波段观察到的增亮结构。我们发现了拓扑爆发的明确证据,这被称为与日冕物质抛射(CME)和爆炸性x射线耀斑相关的拓扑骨架的灾难性变化。这些结果揭示了结构复杂性及其在爆炸磁活动中的作用。通量绳的概念已广泛用于模拟爆炸磁活动,尽管它们的观测特性相当模糊,或者至少缺乏必要的细节。我们认为,与三维螺旋零相关的磁环可能是通量绳物理实体的重要类别。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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