Hui Zhao1; JingXiu Wang1; Jun Zhang1; ChiJie Xiao1; HaiMin Wang2
Source Publicationchineseastronomyandastrophysics
AbstractMagnetic topology has been a key to the understanding of magnetic energy re-lease 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 re-ferred 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 complex-ity 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 ob-scure 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.
Document Type期刊论文
2.Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Hui Zhao,JingXiu Wang,Jun Zhang,et al. determinationofthetopologyskeletonofmagneticfieldsinasolaractiveregion[J]. chineseastronomyandastrophysics,2008,8(2):133.
APA Hui Zhao,JingXiu Wang,Jun Zhang,ChiJie Xiao,&HaiMin Wang.(2008).determinationofthetopologyskeletonofmagneticfieldsinasolaractiveregion.chineseastronomyandastrophysics,8(2),133.
MLA Hui Zhao,et al."determinationofthetopologyskeletonofmagneticfieldsinasolaractiveregion".chineseastronomyandastrophysics 8.2(2008):133.
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