Helicity patterns of the active regions connected by transequatorial loops
文献类型：期刊论文
| 作者 | Chen, Jie ; Bao, Shudong; Zhang, Hongqi
|
| 刊名 | SOLAR PHYSICS
 |
| 出版日期 | 2007-05-01 |
| 卷号 | 242期号:1-2页码:65-85 |
| 英文摘要 | Using photospheric vector magnetograms of the Huairou Solar Observing Station and coronal X-ray images from the Yohkoh Soft X-Ray Telescope, we calculate the helicity patterns of 43 pairs of active regions and the chirality of 50 pairs of opposite magnetic polarity regions that are connected by transequatorial loops (TLs). To make the results more convincing, two helicity proxies including the local current helicity h (c) and the force-free factor alpha(best) are computed. The results, which are similar for both parameters, are as follows: (1) Current helicity of the active regions pairs connected by transequatorial loops have no obvious regularity: About 50% of the active region pairs carry the same current helicity sign and about 50% of them have the opposite. (2) If we consider the magnetic polarity pairs connected by the TLs, the result is almost the same as that for the active region pairs, with a little more than half of them showing the same chirality. We also make linear force-free extrapolations for 33 TLs and determine their force-free parameter alpha by comparing extrapolated field lines to X-ray images of the TLs. Out of the 19 cases when the footpoints of the TLs have the same current helicity sign, we find that the sign of alpha of the TLs is the same as the sign of the current helicity in the footpoints in 12 cases, whereas it is of opposite sign in 4 cases, and in 3 cases the TLs were found to be potential. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000248137000006 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7301]  |
| 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 | Chen, Jie,Bao, Shudong,Zhang, Hongqi. Helicity patterns of the active regions connected by transequatorial loops[J]. SOLAR PHYSICS,2007,242(1-2):65-85. |
| APA | Chen, Jie,Bao, Shudong,&Zhang, Hongqi.(2007).Helicity patterns of the active regions connected by transequatorial loops.SOLAR PHYSICS,242(1-2),65-85. |
| MLA | Chen, Jie,et al."Helicity patterns of the active regions connected by transequatorial loops".SOLAR PHYSICS 242.1-2(2007):65-85. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。