Flare-induced signals in polarization measurements during the X2.6 flare on 2005 January 15
文献类型：期刊论文
| 作者 | Zhao, Meng1 ; Wang, Jing-Xiu1; Matthews, Sarah2; Ding, Ming-De3; Zhao, Hui1; Jin, Chun-Lan1
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2009-07-01 |
| 卷号 | 9期号:7页码:812-828 |
| 关键词 | Sun: magnetic field Sun: flare Sun: activity |
| 英文摘要 | Flare-induced signals in polarization measurements which were manifested as apparent polarity reversal in magnetograms have been reported since 1981. We are motivated to further quantify the phenomenon by asking two questions: can we distinguish the flare-induced signals from real magnetic changes during flares, and what we can learn about flare energy release from the flare-induced signals? We select the X2.6 flare that occurred on 2005 January 15, for further Study. The flare took place in NOAA active region (AR) 10720 at approximately the central meridian, which makes the interpretation of the vector magnetograms less ambiguous. We have identified that flare-induced signals during this flare appeared in six zones. The zones are located within an average distance of 5 Mm from their weight center to the main magnetic neutral line, have an average size of (0.6 +/- 0.4) x 10(17) cm(2), duration of 13 +/- 4 min, and flux density change of 181 +/- 125 G in the area of reversed polarity. The following new facts have been revealed by this study: (1) the flare-induced signal is also seen in the transverse magnetograms but with smaller magnitude, e.g., about 50 G; (2) the flare-induced signal mainly manifests itself as apparent polarity reversal, but the signal starts and ends as a weakening of flux density; (3) The flare-induced signals appear in phase with the peaks of hard X-ray emission as observed by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI), and mostly trace the position of RHESSI hard X-ray footpoint sources. (4) in four zones, it takes place cotemporally with real magnetic changes which persist after the flare. Only for the other two zones does the flux density recover to the pre-flare level immediately after the flare. The physical implications of the flare-induced signal are discussed in view of its relevance to the non-thermal electron precipitation and primary energy release in the flare. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000268130300010 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8353]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England 3.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Meng,Wang, Jing-Xiu,Matthews, Sarah,et al. Flare-induced signals in polarization measurements during the X2.6 flare on 2005 January 15[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(7):812-828. |
| APA | Zhao, Meng,Wang, Jing-Xiu,Matthews, Sarah,Ding, Ming-De,Zhao, Hui,&Jin, Chun-Lan.(2009).Flare-induced signals in polarization measurements during the X2.6 flare on 2005 January 15.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(7),812-828. |
| MLA | Zhao, Meng,et al."Flare-induced signals in polarization measurements during the X2.6 flare on 2005 January 15".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.7(2009):812-828. |
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来源：国家天文台
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