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PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS
Bi Y(毕以)1,2; Jiang YC(姜云春)1; Yang JY(杨家艳)1; Xiang YY(向永源)1; Cai YF(蔡云芳)1; Liu WW(刘威卫)1
Source PublicationASTROPHYSICAL JOURNAL
2015-05-20
Volume805Issue:1
DOI10.1088/0004-637X/805/1/48
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: filaments, prominences Sun: magnetic fields
Abstract

The eruption of a filament in a kinklike fashion is often regarded as a signature of kink instability. However, the kink instability threshold for the filament's magnetic structure is not widely understood. Using Ha observations from the New Vacuum Solar Telescope, we present a partial eruptive filament. During the eruption, the filament thread appeared to split from its middle and to break out in a kinklike fashion. In this period, the remaining filament material stayed below and erupted without the kinking motion later on. The coronal magnetic field lines associated with the filament are obtained from nonlinear force-free field extrapolations using the twelve-minute-cadence vector magnetograms of the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamic Observatory. We studied the extrapolated field lines passing through the magnetic dips which are in good agreement with the observed filament. The field lines are non-uniformly twisted and appear to be composed of two twisted flux ropes winding around each other. One of them has a higher twist than the other, and the flux rope with the higher twist has its dips aligned with the kinking eruptive thread at the beginning of its eruption. Before the eruption, moreover, the flux rope with the higher twist was found to expand with an approximately constant field twist. In addition, the helicity flux maps deduced from the HMI magnetograms show that some helicity is injected into the overlying magnetic arcade, but no significant helicity is injected into the flux ropes. Accordingly, we suggest that the highly twisted flux rope became kink unstable when the instability threshold declined with the expansion of the flux rope.

Funding ProjectNatural Science Foundation of China[11403098] ; Natural Science Foundation of China[11173058] ; Natural Science Foundation of China[11473065] ; Natural Science Foundation of China[11273056] ; Open Research Programs of CAS
Funding OrganizationNatural Science Foundation of China[11403098, 11173058, 11473065, 11273056] ; Open Research Programs of CAS
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
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
Archive Date2015-05-23
WOS IDWOS:000354991300048
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MAGNETIC-FIELDS ; FLUX ROPE ; KINK INSTABILITY ; SOLAR FILAMENT ; MASS EJECTIONS ; OBSERVATIONAL EVIDENCE ; VECTOR MAGNETOGRAPH ; RECONSTRUCTION ; HELICITY ; ROTATION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6268
Collection太阳物理研究组
Corresponding AuthorBi Y(毕以)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Bi Y,Jiang YC,Yang JY,et al. PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS[J]. ASTROPHYSICAL JOURNAL,2015,805(1).
APA Bi Y,Jiang YC,Yang JY,Xiang YY,Cai YF,&Liu WW.(2015).PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS.ASTROPHYSICAL JOURNAL,805(1).
MLA Bi Y,et al."PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS".ASTROPHYSICAL JOURNAL 805.1(2015).
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