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Is pre-eruptive null point reconnection required for triggering eruptions?
Li, Hui; Schmieder, Brigitte; Aulanier, Guillaume; Berlicki, Arkadiusz
2006-08-01
Source PublicationSOLAR PHYSICS
ISSN0038-0938
Volume237Issue:1Pages:85-100
AbstractWe study the magnetic field evolution and topology of the active region NOAA 10486 before the 3B/X1.2 flare of October 26, 2003, using observational data from the French-Italian THEMIS telescope, the Michelson Doppler Imager (MDI) onboard Solar and Heliospheric Observatory (SOHO), the Solar Magnetic Field Telescope (SMFT) at Huairou Solar Observation Station (HSOS), and the Transition Region and Coronal Explorer (TRACE). Three dimensional (3D) extrapolation of photospheric magnetic field, assuming a potential field configuration, reveals the existence of two magnetic null points in the corona above the active region. We look at their role in the triggering of the main flare, by using the bright patches observed in TRACE 1600 angstrom images as tracers at the solar surface of energy release associated with magnetic reconnection at the null points. All the bright patches observed before the flare correspond to the low-altitude null point. They have no direct relationship with the X1.2 flare because the related separatrix is located far from the eruptive site. No bright patch corresponds to the high-altitude null point before the flare. We conclude that eruptions can be triggered without pre-eruptive coronal null point reconnection, and the presence of null points is not a sufficient condition for the occurrence of flares. We propose that this eruptive flare results from the loss of equilibrium due to persistent flux emergence, continuous photospheric motion and strong shear along the magnetic neutral line. The opening of the coronal field lines above the active region should be a byproduct of the large 3B/X1.2 flare rather than its trigger.
KeywordCoronal Mass Ejections Quasi-separatrix Layers Magnetic-field Active-region Solar-flares Shear Evolution Model Multiwavelength Emergence
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11207-006-0173-7
WOS KeywordCORONAL MASS EJECTIONS ; QUASI-SEPARATRIX LAYERS ; MAGNETIC-FIELD ; ACTIVE-REGION ; SOLAR-FLARES ; SHEAR ; EVOLUTION ; MODEL ; MULTIWAVELENGTH ; EMERGENCE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000239734100006
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/3588
Collection太阳高能及相关物理过程研究团组
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Observ Paris, LESIA, Sect Meudon, F-92195 Meudon, France
3.Univ Wroclaw, Astron Inst, PL-51611 Wroclaw, Poland
Recommended Citation
GB/T 7714
Li, Hui,Schmieder, Brigitte,Aulanier, Guillaume,et al. Is pre-eruptive null point reconnection required for triggering eruptions?[J]. SOLAR PHYSICS,2006,237(1):85-100.
APA Li, Hui,Schmieder, Brigitte,Aulanier, Guillaume,&Berlicki, Arkadiusz.(2006).Is pre-eruptive null point reconnection required for triggering eruptions?.SOLAR PHYSICS,237(1),85-100.
MLA Li, Hui,et al."Is pre-eruptive null point reconnection required for triggering eruptions?".SOLAR PHYSICS 237.1(2006):85-100.
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