PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS
文献类型：期刊论文
| 作者 | Bi,Yi1,2; Jiang,Yunchun1; Yang,Jiayan1; Xiang,Yongyuan1; Cai,Yunfang1; Liu,Weiwei1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2015-05-19 |
| 卷号 | 805期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Sun: filaments, prominences Sun: magnetic fields |
| DOI | 10.1088/0004-637X/805/1/48 |
| 英文摘要 | ABSTRACT The eruption of a filament in a kinklike fashion is often regarded as a signature of kink instability. However, the kink instability threshold for the filament’s magnetic structure is not widely understood. Using Hα observations from the New Vacuum Solar Telescope, we present a partial eruptive filament. During the eruption, the filament thread appeared to split from its middle and to break out in a kinklike fashion. In this period, the remaining filament material stayed below and erupted without the kinking motion later on. The coronal magnetic field lines associated with the filament are obtained from nonlinear force-free field extrapolations using the twelve-minute-cadence vector magnetograms of the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamic Observatory. We studied the extrapolated field lines passing through the magnetic dips which are in good agreement with the observed filament. The field lines are non-uniformly twisted and appear to be composed of two twisted flux ropes winding around each other. One of them has a higher twist than the other, and the flux rope with the higher twist has its dips aligned with the kinking eruptive thread at the beginning of its eruption. Before the eruption, moreover, the flux rope with the higher twist was found to expand with an approximately constant field twist. In addition, the helicity flux maps deduced from the HMI magnetograms show that some helicity is injected into the overlying magnetic arcade, but no significant helicity is injected into the flux ropes. Accordingly, we suggest that the highly twisted flux rope became kink unstable when the instability threshold declined with the expansion of the flux rope. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-805-1-48 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/36335]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China; biyi@ynao.ac.cn 2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China |
| 推荐引用方式 GB/T 7714 | Bi,Yi,Jiang,Yunchun,Yang,Jiayan,et al. PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS[J]. The Astrophysical Journal,2015,805(1). |
| APA | Bi,Yi,Jiang,Yunchun,Yang,Jiayan,Xiang,Yongyuan,Cai,Yunfang,&Liu,Weiwei.(2015).PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS.The Astrophysical Journal,805(1). |
| MLA | Bi,Yi,et al."PARTIAL ERUPTION OF A FILAMENT WITH TWISTING NON-UNIFORM FIELDS".The Astrophysical Journal 805.1(2015). |
入库方式： OAI收割
来源：国家天文台
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