Broken-up spectra of the loop-top hard X-ray source during a solar limb flare
文献类型：期刊论文
| 作者 | Ning, Hao2,3; Chen, Yao2,3; Lee, Jeongwoo2,3; Wu, Zhao2,3; Su, Yang1; Kong, Xiang-Liang2,3 |
| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
 |
| 出版日期 | 2019-12-01 |
| 卷号 | 19期号:12页码:10 |
| ISSN号 | 1674-4527 |
| 关键词 | acceleration of particles Sun: corona Sun: flares Sun: UV radiation Sun: X-rays gamma rays |
| DOI | 10.1088/1674-4527/19/12/173 |
| 通讯作者 | Chen, Yao(yaochen@sdu.edu.cn) |
| 英文摘要 | Solar hard X-rays (HXRs) appear in the form of either footpoint sources or coronal sources. Each individual source provides its own critical information on acceleration of nonthermal electrons and plasma heating. Earlier studies found that the HXR emission in some events manifests a broken-up power-law spectrum, with the break energy around a few hundred keV based on spatially-integrated spectral analysis, and it does not distinguish the contributions from individual sources. In this paper, we report on the broken-up spectra of a coronal source studied using HXR data recorded by Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) during the SOL2017-09-10T16:06 (GOES class X8.2) flare. The flare occurred behind the western limb and its footpoint sources were mostly occulted by the disk. We could clearly identify such broken-up spectra pertaining solely to the coronal source during the flare peak time and after. Since a significant pileup effect on the RHESSI spectra is expected for this intense solar flare, we have selected the pileup correction factor, p = 2. In this case, we found the resulting RHESSI temperature (similar to 30 MK) to be similar to the GOES soft X-ray temperature and break energies of 45-60 keV. Above the break energy, the spectrum hardens with time from spectral index of 3.4 to 2.7, and the difference in spectral indices below and above the break energy increases from 1.5 to 5 with time. However, we note that when p = 2 is assumed, a single power-law fitting is also possible with the RHESSI temperature higher than the GOES temperature by similar to 10 MK. Possible scenarios for the broken-up spectra of the loop-top HXR source are briefly discussed. |
| WOS关键词 | STOCHASTIC ACCELERATION ; MAGNETIC RECONNECTION ; BREMSSTRAHLUNG ; MICROWAVE ; ELECTRONS ; EVOLUTION ; EMISSIONS ; CONTINUUM ; BURSTS ; MODEL |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES |
| WOS记录号 | WOS:000507468700005 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35491]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Chen, Yao |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Shandong Univ, Inst Space Sci, Weihai 264209, Peoples R China 3.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ning, Hao,Chen, Yao,Lee, Jeongwoo,et al. Broken-up spectra of the loop-top hard X-ray source during a solar limb flare[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(12):10. |
| APA | Ning, Hao,Chen, Yao,Lee, Jeongwoo,Wu, Zhao,Su, Yang,&Kong, Xiang-Liang.(2019).Broken-up spectra of the loop-top hard X-ray source during a solar limb flare.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(12),10. |
| MLA | Ning, Hao,et al."Broken-up spectra of the loop-top hard X-ray source during a solar limb flare".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.12(2019):10. |
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来源：紫金山天文台
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