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INVESTIGATING TWO SUCCESSIVE FLUX ROPE ERUPTIONS IN A SOLAR ACTIVE REGION
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; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2013-06-01
Volume769Issue:2Pages:L25
ISSN0004-643X
Language英语
KeywordSun: Corona Sun: Coronal Mass Ejections (Cmes) Sun: Flares Sun: Magnetic Topology
AbstractWe 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.; 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.
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1496
Collection空间科学部
Corresponding Author北京8701信箱
Affiliation1.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
Recommended Citation
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..,...&北京8701信箱.(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.
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