The relationship between magnetic gradient and magnetic shear in five super active regions producing great flares
文献类型：期刊论文
| 作者 | Wang, Hai-Min; Song, Hui; Jing, Ju; Yurchyshyn, Vasyl; Deng, Yuan-Yong ; Zhang, Hong-Qi; Falconer, David; Li, Jing; Yuanyong Deng; Hongqi Zhang
|
| 刊名 | CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2006 |
| 卷号 | 6期号:4页码:477-488 |
| 关键词 | Sun : activity Sun : flares Sun : magnetic fields Sun : coronal mass ejections (CMEs) |
| 英文摘要 | We study the magnetic structure of five well-known active regions that produced great flares (X5 or larger). The six flares under investigation are the X12 flare on 1991 June 9 in AR 6659, the X5.7 flare on 2000 July 14 in AR 9077, the X5.6 flare on 2001 April 6 in AR 9415, the X5.3 flare on 2001 August 25 in AR 9591, the X17 flare on 2003 October 28 and the X 10 flare on 2003 October 29, both in AR 10486. The last five events had corresponding LASCO observations and were all associated with Halo CMEs. We analyzed vector magnetograms from Big Bear Solar Observatory, Huairou Solar Observing Station, Marshall Space Flight Center and Mees Solar Observatory. In particular, we studied the magnetic gradient derived from line-of-sight magnetograms and magnetic shear derived from vector magnetograms, and found an apparent correlation between these two parameters at a level of about 90%. We found that the magnetic gradient could be a better proxy than the shear for predicting where a major flare might occur: all six flares occurred in neutral lines with maximum gradient. The mean gradient of the flaring neutral lines ranges from 0.14 to 0.50 G km(-1), 2.3 to 8 times the average value for all the neutral lines in the active regions. If we use magnetic shear as the proxy, the flaring neutral line in at least one, possibly two, of the six events would be mis-identified. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000239902800011 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/7091]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.New Jersey Inst Technol, Big Bear Solar Observ, Big Bear City, CA 92314 USA 3.NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA 4.Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA |
| 推荐引用方式 GB/T 7714 | Wang, Hai-Min,Song, Hui,Jing, Ju,et al. The relationship between magnetic gradient and magnetic shear in five super active regions producing great flares[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2006,6(4):477-488. |
| APA | Wang, Hai-Min.,Song, Hui.,Jing, Ju.,Yurchyshyn, Vasyl.,Deng, Yuan-Yong.,...&Hongqi Zhang.(2006).The relationship between magnetic gradient and magnetic shear in five super active regions producing great flares.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,6(4),477-488. |
| MLA | Wang, Hai-Min,et al."The relationship between magnetic gradient and magnetic shear in five super active regions producing great flares".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 6.4(2006):477-488. |
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。