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A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares
Bi Y(毕以)1,2,3; Liu, Ying D.2,4; Liu YX(刘艳霄)1,3; Yang JY(杨家艳)1,3; Xu Z(徐喆)1,3,4; Ji KF(季凯帆)1,3
Source PublicationASTROPHYSICAL JOURNAL
2018-10-01
Volume865Issue:2Pages:11
DOI10.3847/1538-4357/aada7e
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: corona Sun: flares Sun: magnetic fields Sun: photosphere sunspots
Abstract

Using the 135 s cadence of the photospheric vector data provided by the Helioseismic and Magnetic Imager telescope on board the Solar Dynamic Observatory, we examined the time evolution of magnetic helicity fluxes across the photosphere during 16 flares with the energy class lower than M5.0. During the flare, in four out of 16 events, we found impulsive changes in the helicity fluxes. This indicates that even the flare with less energy could be associated with anomalistic transportation of the magnetic helicity across the photosphere. Accompanying the impulsive helicity fluxes, the poynting fluxes across the photosphere evolved from positive to negative. As such, the transportations of magnetic energy across the photosphere were toward the solar interior during these flares. In each of the four events, the impulsive change in the helicity flux was always mainly contributed by an abrupt change in the horizontal velocity field on a sunspot located near the flaring polarity inversion line. The velocity field on each sunspot shows either an obvious vortex pattern or a shearing pattern relative to the magnetic polarity, which tended to relax the magnetic twist or shear in the corona. During these flares, an abrupt change in the Lorentz force acting on these sunspots was found. The rotational motions and shearing motions of these sunspots always had the same directions with the resultant Lorentz forces. These results support the view that the impulsive helicity transportation during the flare could be driven by the change in the Lorentz force applied on the photosphere.

Funding ProjectNatural Science Foundation of China[11873088] ; Natural Science Foundation of China[11633008] ; Natural Science Foundation of China[11573012] ; Natural Science Foundation of China[11333007] ; Natural Science Foundation of China[11503081] ; Natural Science Foundation of China[11763004] ; CAS[QYZDJ-SSW-SLH012] ; project of the Group for Innovation of Yunnan Province ; Specialized Research Fund for State Key Laboratories
Funding OrganizationNatural Science Foundation of China[11873088, 11633008, 11573012, 11333007, 11503081, 11763004] ; CAS[QYZDJ-SSW-SLH012] ; project of the Group for Innovation of Yunnan Province ; Specialized Research Fund for State Key Laboratories
Language英语
Subject Area天文学
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
WOS IDWOS:000446180200011
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MASS EJECTIONS ; TETHER-CUTTING RECONNECTION ; RAPID SUNSPOT ROTATION ; MAJOR SOLAR EVENT ; REGION NOAA 10930 ; 2011 FEBRUARY 15 ; 2006 DECEMBER 13 ; X-CLASS FLARES ; ACTIVE REGIONS ; FIELD CHANGES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17936
Collection抚仙湖太阳观测站
Corresponding AuthorBi Y(毕以)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
2.State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.University of Chinese Academy of Sciences, 19A Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Bi Y,Liu, Ying D.,Liu YX,et al. A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares[J]. ASTROPHYSICAL JOURNAL,2018,865(2):11.
APA Bi Y,Liu, Ying D.,Liu YX,Yang JY,Xu Z,&Ji KF.(2018).A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares.ASTROPHYSICAL JOURNAL,865(2),11.
MLA Bi Y,et al."A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares".ASTROPHYSICAL JOURNAL 865.2(2018):11.
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