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Sunspot splitting triggering an eruptive flare
Louis, RE1; Puschmann, KG1; Bernhard Kliem2,3,4; Balthasar, H1; Denker, C1
Source PublicationASTRONOMY & ASTROPHYSICS
2014-02
Volume562
DOI10.1051/0004-6361/201321106
Contribution Rank第2完成单位
Indexed BySCI ; EI
KeywordSun: Flares Sunspots Sun: Photosphere Sun: Chromosphere Techniques: Photometric
Abstract

Aims. We investigate how the splitting of the leading sunspot and associated flux emergence and cancellation in active region NOAA 11515 caused an eruptive M5.6 flare on 2012 July 2. 

Methods. Continuum intensity, line-of-sight magnetogram, and dopplergram data of the Helioseismic and Magnetic Imager were employed to analyse the photospheric evolution. Filtergrams in H alpha and He I 10830 angstrom of the Chromospheric Telescope at the Observatorio del Teide, Tenerife, track the evolution of the flare. The corresponding coronal conditions were derived from 171 angstrom and 304 angstrom images of the Atmospheric Imaging Assembly. Local correlation tracking was utilized to determine shear flows. 

Results. Emerging flux formed a neutral line ahead of the leading sunspot and new satellite spots. The sunspot splitting caused a long-lasting flow towards this neutral line, where a filament formed. Further flux emergence, partly of mixed polarity, as well as episodes of flux cancellation occurred repeatedly at the neutral line. Following a nearby C-class precursor flare with signs of interaction with the filament, the filament erupted nearly simultaneously with the onset of the M5.6 flare and evolved into a coronal mass ejection. The sunspot stretched without forming a light bridge, splitting unusually fast (within about a day, complete approximate to 6 h after the eruption) in two nearly equal parts. The front part separated strongly from the active region to approach the neighbouring active region where all its coronal magnetic connections were rooted. It also rotated rapidly (by 4.9 degrees h(-1)) and caused significant shear flows at its edge. 

Conclusions. The eruption resulted from a complex sequence of processes in the (sub-)photosphere and corona. The persistent flows towards the neutral line likely caused the formation of a flux rope that held the filament. These flows, their associated flux cancellation, the emerging flux, and the precursor flare all contributed to the destabilization of the flux rope. We interpret the sunspot splitting as the separation of two flux bundles differently rooted in the convection zone and only temporarily joined in the spot. This explains the rotation as the continued rise of the separating flux, and it implies that at least this part of the sunspot was still connected to its roots deep in the convection zone.

Funding ProjectGerman Science Foundation (DFG)[DE 787/3-1] ; Chinese Academy of Sciences[2012T1J0017] ; DFG ; STFC
Funding OrganizationGerman Science Foundation (DFG)[DE 787/3-1] ; Chinese Academy of Sciences[2012T1J0017] ; DFG ; STFC
Language英语
Subject Area天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000332161800012
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MASS EJECTIONS ; MAGNETIC-FIELD EVOLUTION ; PHOTOSPHERIC FLUX CANCELLATION ; LOCAL CORRELATION TRACKING ; MAJOR SOLAR EVENT ; 2006 DECEMBER 13 ; 2010 APRIL 8 ; ACTIVE-REGION ; ROTATING SUNSPOTS ; EMERGING FLUX
EI Accession Number20140917390856
EI KeywordsShear flow
EI Classification Number631.1Fluid Flow, General - 723.1.1Computer Programming Languages - 804.1Organic Compounds DOI: 10.1051/0004-6361/201321106
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6259
Collection太阳物理研究组
Corresponding AuthorLouis, RE
Affiliation1.Leibniz-Institut für Astrophysik Potsdam (AIP), an der Sternwarte 16, 14482 Potsdam, Germany
2.Yunnan Astronomical Observatory, Chinese Academy of Sciences, 650011 Kunming, PR China
3.Institute of Physics and Astronomy, University of Potsdam, 14476 Potsdam, Germany
4.Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking RH5 6NT, UK
Recommended Citation
GB/T 7714
Louis, RE,Puschmann, KG,Bernhard Kliem,et al. Sunspot splitting triggering an eruptive flare[J]. ASTRONOMY & ASTROPHYSICS,2014,562.
APA Louis, RE,Puschmann, KG,Bernhard Kliem,Balthasar, H,&Denker, C.(2014).Sunspot splitting triggering an eruptive flare.ASTRONOMY & ASTROPHYSICS,562.
MLA Louis, RE,et al."Sunspot splitting triggering an eruptive flare".ASTRONOMY & ASTROPHYSICS 562(2014).
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