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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
发表期刊ASTROPHYSICAL JOURNAL
2018-10-01
卷号865期号:2页码:11
DOI10.3847/1538-4357/aada7e
产权排序第1完成单位
收录类别SCI
关键词Sun: corona Sun: flares Sun: magnetic fields Sun: photosphere sunspots
摘要

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.

资助项目Natural 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
项目资助者Natural 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
语种英语
学科领域天文学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000446180200011
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL 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
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/17936
专题抚仙湖太阳观测站
通讯作者Bi Y(毕以)
作者单位1.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
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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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