NAOC Open IR
Microwave Study of a Solar Circular Ribbon Flare
Lee, Jeongwoo1; White, Stephen M.2; Chen, Xingyao3; Chen, Yao4; Ning, Hao4; Li, Bo4; Masuda, Satoshi5
2020-09-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume901Issue:1Pages:9
AbstractA circular ribbon flare (CRF) SOL2014-12-17T04:51 is studied using the 17/34 GHz maps from the Nobeyama Radioheliograph along with (E)UV and magnetic data from the Solar Dynamics Observatory. We report the following three findings as important features of the microwave CRF. (1) The first preflare activation comes in the form of a gradual increase of the 17 GHz flux without a counterpart at 34 GHz, which indicates thermal preheating. The first sign of nonthermal activity occurs in the form of stepwise flux increases at both 17 and 34 GHz about 4 minutes before the impulsive phase. (2) Until the impulsive phase, the microwave emission over the entire active region is in a single polarization state matching the magnetic polarity of the surrounding fields. During and after the impulsive phase, the sign of the 17 GHz polarization state reverses in the core region, which implies a magnetic breakout-type eruption in a fan-spine magnetic structure. (3) The 17 GHz flux around the time of the eruption shows quasi-periodic variations with periods of 1-2 minutes. The pre-eruption oscillation is more obvious in total intensity at one end of the flare loop, and the post-eruption oscillation, more obvious in the polarized intensity at a region near the inner spine. We interpret this transition as transfer of oscillatory power from kink mode oscillation to torsional Alfven waves propagating along the spine field after the eruption. We argue that these three processes are interrelated and indicate a breakout process in a fan-spine structure.
KeywordSolar magnetic reconnection Solar magnetic fields Alfven waves Solar extreme ultraviolet emission Solar radio emission Solar flares
Funding OrganizationNASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI
DOI10.3847/2041-8213/abb4dd
WOS KeywordMAGNETIC RECONNECTION ; NULL-POINT ; EMISSION ; CORONA ; FIELD ; POLARIZATION ; TOPOLOGY ; DYNAMICS ; SUNSPOT ; MODEL
Language英语
Funding ProjectNASA[80NSSC18K1705] ; NASA[80NSSC18K0673] ; NSF[AGS 1821294] ; NSF[AGS 1927578] ; NNSFC[11973031] ; NNSFC[11790303 (11790300)] ; NNSFC[41774180] ; NNSFC[11761141002] ; JSPS KAKENHI[JP18H01253]
Funding OrganizationNASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI ; NASA ; NASA ; NSF ; NSF ; NNSFC ; NNSFC ; JSPS KAKENHI ; JSPS KAKENHI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000574286200001
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81597
Collection中国科学院国家天文台
Corresponding AuthorLee, Jeongwoo
Affiliation1.New Jersey Inst Technol, Inst Space Weather Sci, Newark, NJ 07102 USA
2.Air Force Res Lab, Space Vehicles Directorate, Albuquerque, NM USA
3.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100101, Peoples R China
4.Shandong Univ, Inst Space Sci, Weihai 264209, Shandong, Peoples R China
5.Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan
Recommended Citation
GB/T 7714
Lee, Jeongwoo,White, Stephen M.,Chen, Xingyao,et al. Microwave Study of a Solar Circular Ribbon Flare[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,901(1):9.
APA Lee, Jeongwoo.,White, Stephen M..,Chen, Xingyao.,Chen, Yao.,Ning, Hao.,...&Masuda, Satoshi.(2020).Microwave Study of a Solar Circular Ribbon Flare.ASTROPHYSICAL JOURNAL LETTERS,901(1),9.
MLA Lee, Jeongwoo,et al."Microwave Study of a Solar Circular Ribbon Flare".ASTROPHYSICAL JOURNAL LETTERS 901.1(2020):9.
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