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Solar flare activity and variability of electric current helicity
Su, KJ; Zhang, HQ; Song, KJ; Sok, KK; Bao, XM
2002-02-01
Source PublicationCHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
Volume2Issue:1Pages:81-91
AbstractRecent study using Huairou vector magnetograph data shows that during flare activity, the current helicity exhibits rapid and substantial variations and, in some cases, a recovering phase. We considered various representative the magnetic configurations. First, interacting twisted magnetic flux tubes are analyzed separately for positive, negative and mixed-sign helicity regions. The results show that the helicity during flares decreases in positive-sign, and increases in negative-sign regions. Then, flaring arcade also shows that the magnitude of the helicity decreases after flares. We also investigated current sheets formed by sheared magnetic field and showed that the current helicity (with either positive and negative signs) vanishes after reconnection. The emergence of twisted flux tubes which can trigger flares may be another source of flare-associated variability of current helicity. We demonstrate the relevance of current helicity to the description of flare activity by comparing its variation with that of shear angle in the active region AR 6891.
KeywordSun : Flare Sun : Current Helicity Sun : Magnetic Shear
Indexed BySCI
Language英语
WOS IDWOS:000174082600010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8530
Collection太阳物理研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Su, KJ,Zhang, HQ,Song, KJ,et al. Solar flare activity and variability of electric current helicity[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2002,2(1):81-91.
APA Su, KJ,Zhang, HQ,Song, KJ,Sok, KK,&Bao, XM.(2002).Solar flare activity and variability of electric current helicity.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2(1),81-91.
MLA Su, KJ,et al."Solar flare activity and variability of electric current helicity".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 2.1(2002):81-91.
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