Solar flare activity and variability of electric current helicity
文献类型：期刊论文
| 作者 | Su, KJ; Zhang, HQ ; Song, KJ; Sok, KK; Bao, XM; Zhang HongQi
|
| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2002-02-01 |
| 卷号 | 2期号:1页码:81-91 |
| 关键词 | Sun : flare Sun : current helicity Sun : magnetic shear |
| 英文摘要 | Recent 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000174082600010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8530]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 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,&Zhang HongQi.(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. |
入库方式： OAI收割
来源：国家天文台
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