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Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks
Ning, Hao; Chen, Yao; Wu, Zhao; Su, Yang; Tian, Hui; Li, Gang; Du, Guohui; Song, Hongqiang
2018
发表期刊ASTROPHYSICAL JOURNAL
卷号854期号:2页码:178
摘要A complete understanding of the onset and subsequent evolution of confined flares has not been achieved. Earlier studies mainly analyzed disk events so as to reveal their magnetic topology and the cause of confinement. In this study, taking advantage of a tandem of instruments working at different wavelengths of X-rays, EUVs, and microwaves, we present dynamic details about a confined flare observed on the northwestern limb of the solar disk on 2016 July 24. The entire dynamic evolutionary process starting from its onset is consistent with a loop-loop interaction scenario. The X-ray profiles manifest an intriguing double-peak feature. From the spectral fitting, it has been found that the first peak is nonthermally dominated, while the second peak is mostly multithermal with a hot (similar to 10 MK) and a super-hot (similar to 30 MK) component. This double-peak feature is unique in that the two peaks are clearly separated by 4 minutes, and the second peak reaches up to 25-50 keV; in addition, at energy bands above 3 keV, the X-ray fluxes decline significantly between the two peaks. This, together with other available imaging and spectral data, manifest a two-stage energy release process. A comprehensive analysis is carried out to investigate the nature of this two-stage process. We conclude that the second stage with the hot and super-hot sources mainly involves direct heating through a loop-loop reconnection at a relatively high altitude in the corona. The uniqueness of the event characteristics and the complete dataset make the study a nice addition to present literature on solar flares.
语种英语
WOS记录号WOS:000426158500008
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/18038
专题太阳高能及相关物理过程研究团组
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Ning, Hao,Chen, Yao,Wu, Zhao,et al. Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks[J]. ASTROPHYSICAL JOURNAL,2018,854(2):178.
APA Ning, Hao.,Chen, Yao.,Wu, Zhao.,Su, Yang.,Tian, Hui.,...&Song, Hongqiang.(2018).Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks.ASTROPHYSICAL JOURNAL,854(2),178.
MLA Ning, Hao,et al."Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks".ASTROPHYSICAL JOURNAL 854.2(2018):178.
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