What determines the intensity of solar flare/CME events?
文献类型：期刊论文
| 作者 | Su, Yingna ; Van Ballegooijen, Adriaan; McCaughey, James; Deluca, Edward; Reeves, Katharine K.; Golub, Leon
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2007-08-20 |
| 卷号 | 665期号:2页码:1448-1459 |
| 关键词 | sun : corona sun : coronal mass ejections (CMEs) sun : flares sun : magnetic fields sun : photosphere |
| ISSN号 | 0004-637X |
| 英文摘要 | We present a comprehensive statistical study addressing the question of what determines the intensity of a solar flare and associated coronal mass ejection (CME). For a sample of 18 two-ribbon flares associated with CMEs, we have examined the correlations between the GOES soft X-ray peak flare flux (PFF), the CME speed (V-CME) obtained from SOHO LASCO observations, and six magnetic parameters of the flaring active region. These six parameters measured from both TRACE and SOHO MDI observations are: the average background magnetic field strength (B), the area of the region where B is counted (S), the magnetic flux of this region (Phi), the initial shear angle (theta(1), measured at the flare onset), the final shear angle (theta(2), measured at the time when the shear change stops), and the change of shear angle (theta(12) = theta(1) - theta(2)) of the footpoints. We have found no correlation between theta(1) and the intensity of flare/CME events, while the other five parameters are either positively or negatively correlated with both log(10)(PFF) and V-CME. Among these five parameters, Phi and theta(12) show the most significant correlations with log(10)(PFF) and V-CME. The fact that both log(10)(PFF) and V-CME are highly correlated with theta(12) rather than with theta(1) indicates that the intensity of flare/CME events may depend on the released magnetic free energy rather than the total free energy stored prior to the flare. We have also found that a linear combination of a subset of these six parameters shows a much better correlation with the intensity of flare/CME events than each parameter itself, and the combination of log(10) Phi, theta(1), and theta(12) is the top-ranked combination. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CORONAL MASS EJECTIONS ; ACTIVE REGIONS ; MAGNETIC ENERGY ; CME VELOCITY ; FLUX ; MODEL ; CONFIGURATION ; RECONNECTION ; ENERGETICS ; SHEAR |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000248676200051 |
| 公开日期 | 2012-02-05 |
| 源URL | [http://159.226.72.40/handle/332002/2402]  |
| 专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
| 作者单位 | 1.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 2.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Su, Yingna,Van Ballegooijen, Adriaan,McCaughey, James,et al. What determines the intensity of solar flare/CME events?[J]. ASTROPHYSICAL JOURNAL,2007,665(2):1448-1459. |
| APA | Su, Yingna,Van Ballegooijen, Adriaan,McCaughey, James,Deluca, Edward,Reeves, Katharine K.,&Golub, Leon.(2007).What determines the intensity of solar flare/CME events?.ASTROPHYSICAL JOURNAL,665(2),1448-1459. |
| MLA | Su, Yingna,et al."What determines the intensity of solar flare/CME events?".ASTROPHYSICAL JOURNAL 665.2(2007):1448-1459. |
入库方式： OAI收割
来源：紫金山天文台
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