PMO OpenIR  > 太阳和太阳系等离子体研究团组
Non-potentiality of the magnetic field beneath the eruptive filament in the Bastille event
Tian, LR; Wang, JX; Wu, DJ
2002-10-01
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume209Issue:2Pages:375-389
AbstractBased on photospheric vector magnetograms obtained at Huairou Solar Observing Station (HSOS), non-potential characteristics of the magnetic field beneath the filament in active region NOAA 9077 are investigated. We focus on the structure and evolution of the magnetic field from 00: 08 UT to 10: 25 UT of 14 July before the Bastille event. Particular attention is paid to transverse field strength, shear degree and horizontal gradient of the line-of-sight magnetic field around the filament and filament channel. The following characteristics are found. ( 1) The magnetic non-potentiality has an obviously non-uniform distribution. The shear degree of the transverse field (Hagyard et al., 1984) is very large, up to 75degrees in some sites beneath the filament, such as the initial brightening site in TRACE 1600 Angstrom images and the breaking site of the filament. The transverse field and the horizontal gradient of the line-of-sight field are very large in some parts corresponding to the hottest and continuously brightening portions. ( 2) The mean strength and mean shear angle of the transverse field and mean horizontal gradient of the line-of-sight field have obviously dropped in most parts beneath the filament for two hours before the filament eruption and onset of the X5.7/3B flare. After comparing simultaneous UV and EUV images, Hbeta filtergrams and Dopplergrams at solar atmosphere, we suggest that magnetic cancellation is likely to quickly transport the magnetic energy and complexity into the higher atmosphere in these two hours. This leads to magnetic instability in the filament and eventually causes the eruption of filament and onset of the flare.
Keyword2000 July 14 Flares Shear Cancellation Region
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS Keyword2000 JULY 14 ; FLARES ; SHEAR ; CANCELLATION ; REGION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000179498900011
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7787
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Tian, LR,Wang, JX,Wu, DJ. Non-potentiality of the magnetic field beneath the eruptive filament in the Bastille event[J]. SOLAR PHYSICS,2002,209(2):375-389.
APA Tian, LR,Wang, JX,&Wu, DJ.(2002).Non-potentiality of the magnetic field beneath the eruptive filament in the Bastille event.SOLAR PHYSICS,209(2),375-389.
MLA Tian, LR,et al."Non-potentiality of the magnetic field beneath the eruptive filament in the Bastille event".SOLAR PHYSICS 209.2(2002):375-389.
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