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Decimetric Type-U Solar Radio Bursts and Associated EUV Phenomena on 2011 February 9
Gao GN(高冠男)1,2; Cai, Qiangwei3; Guo SJ(郭少杰)1,2,4; Wang M(汪敏)1,2
Source PublicationASTROPHYSICAL JOURNAL
2021-12
Volume923Issue:2
DOI10.3847/1538-4357/ac3135
Contribution Rank第1完成单位
Indexed BySCI
Abstract

A GOES M1.9 flare took place in active region AR 11153 on 2011 February 9. With a resolution of 200 kHz and a time cadence of 80 ms, the reverse-drifting (RS) type-III bursts, intermittent sequence of type-U bursts, drifting pulsation structure (DPS), and fine structures were observed by the Yunnan Observatories Solar Radio Spectrometer (YNSRS). Combined information revealed by the multiwavelength data indicated that after the DPS was observed by YNSRS, the generation rate of type-U bursts suddenly increased to 5 times what it had been. In this event, the generation rate of type-U bursts may depend on the magnetic-reconnection rate. Our observations are consistent with previous numerical simulation results. After the first plasmoid produced (plasma instability occurred), the magnetic-reconnection rate suddenly increased by 5 to 8 times. Furthermore, after the DPS, the frequency range of the turnover frequency of type-U bursts was obviously broadened to thrice what it was before, which indicates a fluctuation amplitude of the density in the loop top. Our observations also support numerical simulations during the flare-impulsive phase. Turbulence occurs at the top of the flare loop and the plasmoids can trap nonthermal particles, causing density fluctuation at the loop top. The observations are generally consistent with the results of numerical simulations, helping us to better understand the characteristics of the whole physical process of eruption.

Funding ProjectNSFCNational Natural Science Foundation of China (NSFC)[11941003] ; NSFCNational Natural Science Foundation of China (NSFC)[11403099] ; NSFCNational Natural Science Foundation of China (NSFC)[11663007] ; NSFCNational Natural Science Foundation of China (NSFC)[11703089] ; NSFCNational Natural Science Foundation of China (NSFC)[U1631130] ; NSFCNational Natural Science Foundation of China (NSFC)[11333007] ; International Space Science Institute in Beijing (ISSI-BJ) ; Natural Science Foundation of Henan Province[212300410210]
Funding OrganizationNSFCNational Natural Science Foundation of China (NSFC)[11941003, 11403099, 11663007, 11703089, U1631130, 11333007] ; International Space Science Institute in Beijing (ISSI-BJ) ; Natural Science Foundation of Henan Province[212300410210]
Language英语
Subject Area天文学 ; 射电天文学 ; 太阳与太阳系 ; 太阳物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP Publishing Ltd
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000735170800001
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordFINE-STRUCTURE ; RECONNECTION ; LOOPS ; DYNAMICS ; MOTIONS
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ynao.ac.cn/handle/114a53/24759
Collection射电天文研究组
Corresponding AuthorGao GN(高冠男)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, People's Republic of China;
2.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing, 100012, People's Republic of China;
3.Institute of Space Physics, Luoyang Normal University, Luoyang, 471934, People's Republic of China;
4.University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gao GN,Cai, Qiangwei,Guo SJ,et al. Decimetric Type-U Solar Radio Bursts and Associated EUV Phenomena on 2011 February 9[J]. ASTROPHYSICAL JOURNAL,2021,923(2).
APA Gao GN,Cai, Qiangwei,Guo SJ,&Wang M.(2021).Decimetric Type-U Solar Radio Bursts and Associated EUV Phenomena on 2011 February 9.ASTROPHYSICAL JOURNAL,923(2).
MLA Gao GN,et al."Decimetric Type-U Solar Radio Bursts and Associated EUV Phenomena on 2011 February 9".ASTROPHYSICAL JOURNAL 923.2(2021).
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