INVESTIGATING TWO SUCCESSIVE FLUX ROPE ERUPTIONS IN A SOLAR ACTIVE REGION
文献类型：期刊论文
| 作者 | Cheng, X.1,2; Zhang, J.1,3; Ding, M. D.1,2; Olmedo, O.4; Sun, X. D.5; Guo, Y.1,2; Liu, Y.6 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2013-06-01 |
| 卷号 | 769期号:2页码:L25 |
| ISSN号 | 0004-643X |
| 关键词 | Sun: corona Sun: coronal mass ejections (CMEs) Sun: flares Sun: magnetic topology |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | We investigate two successive flux rope (FR1 and FR2) eruptions resulting in two coronal mass ejections (CMEs) on 2012 January 23. Both flux ropes (FRs) appeared as an EUV channel structure in the images of high temperature passbands of the Atmospheric Imaging Assembly prior to the CME eruption. Through fitting their height evolution with a function consisting of linear and exponential components, we determine the onset time of the FR impulsive acceleration with high temporal accuracy for the first time. Using this onset time, we divide the evolution of the FRs in the low corona into two phases: a slow rise phase and an impulsive acceleration phase. In the slow rise phase of FR1, the appearance of sporadic EUV and UV brightening and the strong shearing along the polarity inverse line indicates that the quasi-separatrix-layer reconnection likely initiates the slow rise. On the other hand, for FR2, we mainly contribute its slow rise to the FR1 eruption, which partially opened the overlying field and thus decreased the magnetic restriction. At the onset of the impulsive acceleration phase, FR1 (FR2) reaches the critical height of 84.4 ± 11.2 Mm (86.2 ± 13.0 Mm) where the decline of the overlying field with height is fast enough to trigger the torus instability. After a very short interval (~2 minutes), the flare emission began to enhance. These results reveal the compound activity involving multiple magnetic FRs and further suggest that the ideal torus instability probably plays the essential role of initiating the impulsive acceleration of CMEs. |
| 英文摘要 | We investigate two successive flux rope (FR1 and FR2) eruptions resulting in two coronal mass ejections (CMEs) on 2012 January 23. Both flux ropes (FRs) appeared as an EUV channel structure in the images of high temperature passbands of the Atmospheric Imaging Assembly prior to the CME eruption. Through fitting their height evolution with a function consisting of linear and exponential components, we determine the onset time of the FR impulsive acceleration with high temporal accuracy for the first time. Using this onset time, we divide the evolution of the FRs in the low corona into two phases: a slow rise phase and an impulsive acceleration phase. In the slow rise phase of FR1, the appearance of sporadic EUV and UV brightening and the strong shearing along the polarity inverse line indicates that the quasi-separatrix-layer reconnection likely initiates the slow rise. On the other hand, for FR2, we mainly contribute its slow rise to the FR1 eruption, which partially opened the overlying field and thus decreased the magnetic restriction. At the onset of the impulsive acceleration phase, FR1 (FR2) reaches the critical height of 84.4 +/- 11.2 Mm (86.2 +/- 13.0 Mm) where the decline of the overlying field with height is fast enough to trigger the torus instability. After a very short interval (similar to 2 minutes), the flare emission began to enhance. These results reveal the compound activity involving multiple magnetic FRs and further suggest that the ideal torus instability probably plays the essential role of initiating the impulsive acceleration of CMEs. |
| 学科主题 | 空间物理 |
| 语种 | 英语 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1496]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 作者单位 | 1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Jiangsu, Peoples R China 2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China 3.George Mason Univ, Sch Phys Astron & Computat Sci, Fairfax, VA 22030 USA 4.USN, Res Lab, NRC, Washington, DC 20375 USA 5.Stanford Univ, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA 6.Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cheng, X.,Zhang, J.,Ding, M. D.,et al. INVESTIGATING TWO SUCCESSIVE FLUX ROPE ERUPTIONS IN A SOLAR ACTIVE REGION[J]. ASTROPHYSICAL JOURNAL LETTERS,2013,769(2):L25. |
| APA | Cheng, X..,Zhang, J..,Ding, M. D..,Olmedo, O..,Sun, X. D..,...&Liu, Y..(2013).INVESTIGATING TWO SUCCESSIVE FLUX ROPE ERUPTIONS IN A SOLAR ACTIVE REGION.ASTROPHYSICAL JOURNAL LETTERS,769(2),L25. |
| MLA | Cheng, X.,et al."INVESTIGATING TWO SUCCESSIVE FLUX ROPE ERUPTIONS IN A SOLAR ACTIVE REGION".ASTROPHYSICAL JOURNAL LETTERS 769.2(2013):L25. |
入库方式： OAI收割
来源：国家空间科学中心
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