Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks

	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
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	854 期号:2 页码:178
英文摘要	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
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/18038]
专题	中国科学院紫金山天文台
推荐引用方式 GB/T 7714	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.