A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares
A Survey of Changes in Magnetic Helicity Flux on the Photosphere During Relatively Low-class Flares
复制标题
相对低级耀斑期间光球层磁螺旋通量变化的调查
DOI：
10.3847/1538-4357/aada7e
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发表时间：
2018-08
影响因子：
4.9
通讯作者：
Ji Kaifan
中科院分区：
文献类型：
--
作者：
Bi Yi;Liu Ying D.;Liu Yanxiao;Yang Jiayan;Xu Zhe;Ji Kaifan
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.
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DOI：
10.1088/2041-8205/782/1/l10
发表时间：
2014-01
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Tibor Torok;J. Leake;Viacheslav S. Titov;V. Archontis;Zoran Miki'c;M. Linton;K. Dalmasse;Guillaume Aulanier;B. Kliem
通讯作者：
Tibor Torok;J. Leake;Viacheslav S. Titov;V. Archontis;Zoran Miki'c;M. Linton;K. Dalmasse;Guillaume Aulanier;B. Kliem
影响因子：
2.6
作者：
P. Démoulin
通讯作者：
P. Démoulin
DOI：
10.3847/1538-4357/aabc0e
发表时间：
2018-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Juntao Wang;P. Simões;L. Fletcher
通讯作者：
Juntao Wang;P. Simões;L. Fletcher
DOI：
10.1086/506320
发表时间：
2006-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Haimin Wang
通讯作者：
Haimin Wang
DOI：
10.1111/j.1949-8594.1953.tb06864.x
发表时间：
1996
期刊：
--
影响因子：
--
作者：
P. Benson;D. Elmegreen
通讯作者：
P. Benson;D. Elmegreen