IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP
文献类型：期刊论文
| 作者 | Liu, Siming1 ; Li, Youping1; Fletcher, Lyndsay2
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2013-06-01 |
| 卷号 | 769期号:2页码:0 |
| 关键词 | acceleration of particles magnetic reconnection opacity radiation mechanisms: thermal Sun: atmosphere Sun: flares |
| ISSN号 | 0004-637X |
| 通讯作者 | Liu, SM (reprint author), Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China. Email: liusm@pmo.ac.cn |
| 英文摘要 | Understanding the relationship among different emission components plays an essential role in the study of particle acceleration and energy conversion in solar flares. In flares where gradual and impulsive emission components can be readily identified, the impulsive emission has been attributed to non-thermal particles. We carry out detailed analysis of H alpha and X-ray observations of a GOES class B microflare loop on the solar disk. The impulsive hard X-ray emission, however, is found to be consistent with a hot, quasi-thermal origin, and there is little evidence of emission from chromospheric footpoints, which challenges conventional models of flares and reveals a class of microflares associated with dense loops. H alpha observations indicate that the loop lies very low in the solar corona or even in the chromosphere and both emission and absorption materials evolve during the flare. The enhanced H alpha emission may very well originate from the photosphere when the low-lying flare loop heats up the underlying chromosphere and reduces the corresponding H alpha opacity. These observations may be compared with detailed modeling of flare loops with the internal kink instability, where the mode remains confined in space without apparent change in the global field shape, to uncover the underlying physical processes and to probe the structure of solar atmosphere. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | REGION TRANSIENT BRIGHTENINGS ; SOLAR-FLARES ; FREQUENCY-DISTRIBUTIONS ; PARTICLE-ACCELERATION ; KINK INSTABILITY ; ENERGY-RELEASE ; RECONNECTION ; RHESSI ; HARD ; MICROWAVE |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000319999100051 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9862]  |
| 专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China 2.Univ Glasgow, SUPA Sch Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland |
| 推荐引用方式 GB/T 7714 | Liu, Siming,Li, Youping,Fletcher, Lyndsay. IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP[J]. ASTROPHYSICAL JOURNAL,2013,769(2):0. |
| APA | Liu, Siming,Li, Youping,&Fletcher, Lyndsay.(2013).IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP.ASTROPHYSICAL JOURNAL,769(2),0. |
| MLA | Liu, Siming,et al."IMPULSIVE THERMAL X-RAY EMISSION FROM A LOW-LYING CORONAL LOOP".ASTROPHYSICAL JOURNAL 769.2(2013):0. |
入库方式： OAI收割
来源：紫金山天文台
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