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The magnetic topological structure and energy of the 2B/X2 flare in NOAA 8100
Yan, YH; Liu, Y; Akioka, M; Wei, FS
2001-07-01
Source PublicationSOLAR PHYSICS
Volume201Issue:2Pages:337-355
AbstractIn this paper, we reconstruct the finite energy force-free magnetic field of the active region NOAA 8100 on 4 November 1997 above the photosphere. In particular, the 3-D magnetic field structures before and after a 2B/X2 flare at 05:58 UT in this region are analyzed. The magnetic field lines were extrapolated in close coincidence with the Yohkoh soft X-ray (SXR) loops accordingly. It is found that the active region is composed of an emerging flux loop, a complex loop system with differential magnetic field shear, and large-scale, or open field lines. Similar magnetic connectivity has been obtained for both instants but apparent changes of the twisting situations of the calculated magnetic field lines can be observed that properly align with the corresponding SXR coronal loops. We conclude that this flare was triggered by the interaction of an emerging flux loop and a large loop system with differential magnetic field shear, as well as large-scale, or open field lines. The onset of the flare was at the common footpoints of several interacting magnetic loops and confined near the footpoints of the emerging flux loop. The sheared configuration remained even after the energetic flare, as demonstrated by calculated values of the twist for the loop system, which means that the active region was relaxed to a lower energy state but not completely to the minimum energy state (two days later another X-class flare occurred in this region).
Indexed BySCI
Language英语
WOS IDWOS:000170941000009
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8571
Collection太阳物理研究部
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Hiraiso Solar Terr Res Ctr, Commun Res Lab, Hitachinaka, Ibaraki 3111202, Japan
3.Beijing Univ, Chinese Acad Sci, Joint Beijing Astrophys Ctr, Beijing 100871, Peoples R China
4.Chinese Acad Sci, CSSAR, Lab Heliospher Phys, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Yan, YH,Liu, Y,Akioka, M,et al. The magnetic topological structure and energy of the 2B/X2 flare in NOAA 8100[J]. SOLAR PHYSICS,2001,201(2):337-355.
APA Yan, YH,Liu, Y,Akioka, M,&Wei, FS.(2001).The magnetic topological structure and energy of the 2B/X2 flare in NOAA 8100.SOLAR PHYSICS,201(2),337-355.
MLA Yan, YH,et al."The magnetic topological structure and energy of the 2B/X2 flare in NOAA 8100".SOLAR PHYSICS 201.2(2001):337-355.
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