OBSERVATIONS OF MAGNETIC FLUX-ROPE OSCILLATION DURING THE PRECURSOR PHASE OF A SOLAR ERUPTION
文献类型：期刊论文
| 作者 | Zhou, G. P.1,2 ; Zhang, J.2; Wang, J. X.1
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| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
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| 出版日期 | 2016-05-20 |
| 卷号 | 823期号:1 |
| 关键词 | Sun: activity Sun: corona Sun: flares Sun: oscillations |
| 英文摘要 | Based on combined observations from the Interface Region Imaging Spectrograph (IRIS) spectrometer with the coronal emission line of Fe XXI at 1354.08 angstrom and SDO/AIA images in multiple passbands, we report the finding of the precursor activity manifested as the transverse oscillation of a sigmoid, which is likely a pre-existing magnetic flux rope (MFR), that led to the onset of an X class flare and a fast halo coronal mass ejection (CME) on 2014 September 10. The IRIS slit is situated at a fixed position that is almost vertical to the main axis of the sigmoid structure that has a length of about 1.8 x 10(5) km. This precursor oscillation lasts for about 13 minutes in the MFR and has velocities in the range of [-9, 11] km s(-1) and a period of similar to 280 s. Our analysis, which is based on the temperature, density, length, and magnetic field strength of the observed sigmoid, indicates that the nature of the oscillation is a standing wave of fast magnetoacoustic kink mode. We further find that the precursor oscillation is excited by the energy released through an external magnetic reconnection between the unstable MFR and the ambient magnetic field. It is proposed that this precursor activity leads to the dynamic formation of a current sheet underneath the MFR that subsequently reconnects to trigger the onset of the main phase of the flare and the CME. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000376391700019 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/5391]  |
| 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.George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA |
| 推荐引用方式 GB/T 7714 | Zhou, G. P.,Zhang, J.,Wang, J. X.. OBSERVATIONS OF MAGNETIC FLUX-ROPE OSCILLATION DURING THE PRECURSOR PHASE OF A SOLAR ERUPTION[J]. ASTROPHYSICAL JOURNAL LETTERS,2016,823(1). |
| APA | Zhou, G. P.,Zhang, J.,&Wang, J. X..(2016).OBSERVATIONS OF MAGNETIC FLUX-ROPE OSCILLATION DURING THE PRECURSOR PHASE OF A SOLAR ERUPTION.ASTROPHYSICAL JOURNAL LETTERS,823(1). |
| MLA | Zhou, G. P.,et al."OBSERVATIONS OF MAGNETIC FLUX-ROPE OSCILLATION DURING THE PRECURSOR PHASE OF A SOLAR ERUPTION".ASTROPHYSICAL JOURNAL LETTERS 823.1(2016). |
入库方式： OAI收割
来源：国家天文台
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