Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare
文献类型：期刊论文
| 作者 | Shi, Guanglu3,4; Feng, Li3,4; Chen, Jun4; Ying, Beili4; Li, Shuting3,4; Li, Qiao3,4; Li, Hui3,4; Li, Ying3,4; Ji KF(季凯帆)2 ; Huang, Yu3,4
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| 刊名 | SOLAR PHYSICS
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| 出版日期 | 2024-07 |
| 卷号 | 299期号:7 |
| 关键词 | Flares Energetic particles Heating In flares Active regions Magnetic fields Spectrum X-ray |
| ISSN号 | 0038-0938 |
| DOI | 10.1007/s11207-024-02349-0 |
| 产权排序 | 第3完成单位 |
| 文献子类 | Article |
| 英文摘要 | The asymmetry in hard X-ray (HXR) emission at the footpoints (FPs) of flare loops is a ubiquitous feature closely associated with nonthermal electron transport. In this study, we analyze the asymmetric HXR radiation at two flare ribbons, which is thermal-dominated during a long-duration C4.4 flare that occurred on March 20, 2023, combining multi-view and multi-waveband observations from the Advanced Space-based Solar Observatory (ASO-S), Solar Orbiter (SolO), and Solar Dynamics Observatory (SDO) spacecraft. We find that the H i Lyman-alpha (Ly alpha) emission presents similar features to the He ii lambda 304 emission, both in the light curve and spatio-temporal evolution of a pair of conjugate flare ribbons. The spectra and imaging analysis of the HXR emission, detected by the Spectrometer Telescope for Imaging X-rays (STIX) in 4-18 keV, reveal that the two-ribbon flare radiation is thermal dominated by over 95%, and the radiation source mainly concentrates on the northern ribbon, leading to an asymmetric distribution. To understand the underlying reasons for the HXR radiation asymmetry, we extrapolate the magnetic field within the active region using the nonlinear force-free field (NLFFF) model. For 78% of the magnetic field lines starting from the northern flare ribbon, their lengths from the loop-tops (LTs) to the northern FPs are shorter than those to the southern FPs. For 62% of the field lines, their magnetic-field strengths at the southern FPs exceed those at the northern FPs. In addition, considering the larger density, approximate to 1.0 x 10(10) cm(-3), of the low-lying flare loops (<32 Mm), we find that the shorter path from the LT to the northern FP enables more electrons to reach the northern FP more easily after collisions with the surrounding plasma. Therefore, in this thermal-dominated C-class flare, the asymmetric location of the flare LT relative to its two FPs plays a dominant role in the HXR radiation asymmetry, while such asymmetry is also slightly influenced by the magnetic mirror effect, resulting in larger HXR radiation at the FPs with weaker magnetic strength. Our study enriches the understanding of particle transport processes during solar flares. |
| 学科主题 | 天文学 ; 太阳与太阳系 |
| URL标识 | 查看原文 |
| 出版地 | VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS |
| WOS关键词 | PARTICLE-ACCELERATION ; SOLAR-FLARE ; EMISSION ; ELECTRONS |
| 资助项目 | Strategic Priority Research Program of the Chinese Academy of Sciences; Strategic Priority Research Program on Space Science, Chinese Academy of Sciences; Star (LWS) Program; China National Space Administration |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001281063000001 |
| 出版者 | SPRINGER |
| 资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program on Space Science, Chinese Academy of Sciences ; Star (LWS) Program ; China National Space Administration |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/27509]  |
| 专题 | 天文技术实验室 |
| 作者单位 | 1.University of Chinese Academy of Sciences, Nanjing, 211135, China 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China; 3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, 230026, China; 4.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210023, China; |
| 推荐引用方式 GB/T 7714 | Shi, Guanglu,Feng, Li,Chen, Jun,et al. Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare[J]. SOLAR PHYSICS,2024,299(7). |
| APA | Shi, Guanglu.,Feng, Li.,Chen, Jun.,Ying, Beili.,Li, Shuting.,...&Gan, Weiqun.(2024).Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare.SOLAR PHYSICS,299(7). |
| MLA | Shi, Guanglu,et al."Asymmetric Hard X-ray Radiation of Two Ribbons in a Thermal-Dominated C-Class Flare".SOLAR PHYSICS 299.7(2024). |
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来源：云南天文台
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