Fast degradation of the circular flare ribbon on 2014 August 24
文献类型：期刊论文
| 作者 | Zhang, Q. M.1,2; Yang, S. H.1,3; Li, T.1,3; Hou, Y. J.1,3; Li, Y.2 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2020-04-28 |
| 卷号 | 636页码:4 |
| ISSN号 | 0004-6361 |
| 关键词 | Sun: flares Sun: UV radiation Sun: X-rays gamma rays Sun: magnetic fields Sun: filaments prominences |
| DOI | 10.1051/0004-6361/202038072 |
| 英文摘要 | Context. The separation and elongation motions of solar flare ribbons have extensively been investigated. The degradation and disappearance of ribbons have rarely been explored.Aims. We report our multiwavelength observations of a C5.5 circular-ribbon flare associated with two jets (jet1 and jet2) on 2014 August 24, focusing on the fast degradation of the outer circular ribbon (CR).Methods. The flare was observed in ultraviolet (UV) and extreme-ultraviolet (EUV) wavelengths by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory spacecraft. Soft X-ray fluxes of the flare in 0.5-4 and 1-8 angstrom were recorded by the GOES spacecraft.Results. The flare, consisting of a short inner ribbon (IR) and outer CR, was triggered by the eruption of a minifilament. The brightness of IR and outer CR reached their maxima simultaneously at similar to 04:58 UT in all AIA wavelengths. Subsequently, the short eastern part of the CR faded out quickly in 1600 angstrom but only gradually in EUV wavelengths. The long western part of the CR degraded in the counterclockwise direction and decelerated. The degradation was distinctly divided into two phases: phase I with faster apparent speeds (58-69 km s(-1)), and phase II with slower apparent speeds (29-35 km s(-1)). The second phase stopped at similar to 05:10 UT when the western CR disappeared entirely. In addition to the outward propagation of jet1, the jet spire experienced untwisting motion in the counterclockwise direction during 04:55-05:00 UT.Conclusions. We conclude that the event can be explained by the breakout jet model. The coherent brightenings of the IR and CR at similar to 04:58 UT may result from the impulsive interchange reconnection near the null point, whereas sub-Alfvenic slipping motion of the western CR in the counterclockwise direction indicates the occurrence of slipping magnetic reconnection. Another possible explanation of the quick disappearance of the hot loops that are connected to the western CR is that they are simply reconnected sequentially without the need for significant slippage after the null-point reconnection. |
| WOS关键词 | MAGNETIC RECONNECTION ; SOLAR ; MOTION |
| 资助项目 | NSFC[11773079] ; NSFC[11790302] ; NSFC[11673035] ; NSFC[11773039] ; NSFC[11903050] ; NSFC[11790304] ; NSFC[11873095] ; International Cooperation and Interchange Program[11961131002] ; Youth Innovation Promotion Association CAS ; Science and Technology Development Fund of Macau[275/2017/A] ; Strategic Priority Research Program on Space Science, CAS[XDA15052200] ; Strategic Priority Research Program on Space Science, CAS[XDA15320301] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA202006] ; Specialized Research Fund for State Key Laboratories |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | EDP SCIENCES S A |
| WOS记录号 | WOS:000530408300003 |
| 资助机构 | NSFC ; NSFC ; International Cooperation and Interchange Program ; International Cooperation and Interchange Program ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NSFC ; NSFC ; International Cooperation and Interchange Program ; International Cooperation and Interchange Program ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NSFC ; NSFC ; International Cooperation and Interchange Program ; International Cooperation and Interchange Program ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories ; NSFC ; NSFC ; International Cooperation and Interchange Program ; International Cooperation and Interchange Program ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Science and Technology Development Fund of Macau ; Science and Technology Development Fund of Macau ; Strategic Priority Research Program on Space Science, CAS ; Strategic Priority Research Program on Space Science, CAS ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories ; Specialized Research Fund for State Key Laboratories ; Specialized Research Fund for State Key Laboratories |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/55181]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Zhang, Q. M. |
| 作者单位 | 1.Chinese Acad Sci, CAS Key Lab Solar Act, Natl Astron Observ, Beijing 100101, Peoples R China 2.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210033, Peoples R China 3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Q. M.,Yang, S. H.,Li, T.,et al. Fast degradation of the circular flare ribbon on 2014 August 24[J]. ASTRONOMY & ASTROPHYSICS,2020,636:4. |
| APA | Zhang, Q. M.,Yang, S. H.,Li, T.,Hou, Y. J.,&Li, Y..(2020).Fast degradation of the circular flare ribbon on 2014 August 24.ASTRONOMY & ASTROPHYSICS,636,4. |
| MLA | Zhang, Q. M.,et al."Fast degradation of the circular flare ribbon on 2014 August 24".ASTRONOMY & ASTROPHYSICS 636(2020):4. |
入库方式： OAI收割
来源：国家天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。