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Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks
Ning, Hao1,2; Chen, Yao1,2; Wu, Zhao1,2; Su, Yang3; Tian, Hui4; Li, Gang5,6; Du, Guohui1,2; Song, Hongqiang1,2
2018-02-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume854Issue:2Pages:12
Abstract

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.

KeywordSun: corona Sun: flares Sun: radio radiation Sun: UV radiation Sun: X-rays, gamma rays
DOI10.3847/1538-4357/aaaa69
WOS KeywordCORONAL MASS EJECTIONS ; MAGNETIC RECONNECTION ; SOLAR-FLARES ; FLUX ROPES ; X-RAYS ; RHESSI ; EMISSION ; MODEL ; ERUPTIONS ; RADIO
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000426158500008
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22317
Collection中国科学院紫金山天文台
Corresponding AuthorChen, Yao
Affiliation1.Shandong Univ, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Shandong, Peoples R China
2.Shandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
5.Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USA
6.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
Recommended Citation
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):12.
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),12.
MLA Ning, Hao,et al."Two-stage Energy Release Process of a Confined Flare with Double HXR Peaks".ASTROPHYSICAL JOURNAL 854.2(2018):12.
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