Quasi-periodic Pulsations before and during a Solar Flare in AR 12242

doi:10.3847/1538-4357/ab1d64

CORC > 国家天文台 > 中国科学院国家天文台

	Quasi-periodic Pulsations before and during a Solar Flare in AR 12242
	Chen, Xingyao 1,2; Yan, Yihua 1,2; Tan, Baolin 1,2; Huang, Jing 1,2; Wang, Wei 1; Chen, Linjie 1; Zhang, Yin 1; Tan, Chengming 1,2; Liu, Donghao 1; Masuda, Satoshi 3
刊名	ASTROPHYSICAL JOURNAL
	2019-06-20
卷号	878 期号:2 页码:12
关键词	Sun: flares Sun: oscillations Sun: radio radiation
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1d64
英文摘要	Quasi-periodic pulsations (QPPs) are frequently observed in solar flares, which may reveal some essential characteristics of both thermal and nonthermal energy releases. This work presents multi-wavelength imaging observations of an M8.7 flare in active region AR 12242 on 2014 December 17. We found that there were three different QPPs: UV QPPs with a period of about 4 minutes at 1600 angstrom images near the center of the active region lasting from the preflare phase to the impulsive phase; EUV QPPs with a period of about 3 minutes along the circular ribbon during the preflare phase; and radio QPPs with a period of about 2 minutes at frequencies of 1.2-2.0 GHz around the flaring source region during the impulsive phase. The observations include the radio images observed by the Mingantu Spectral Radioheliograph in China at frequencies of 1.2-2.0 GHz for the first time, microwave images by the Nobeyama Radioheliograph, UV and EUV images by AIA/SDO, and a magnetogram by HMI/SDO. We suggest that the 4 minute UV QPPs should be modulated by the sunspot oscillations, and the 3 minute EUV QPPs are closely related to the 2 minute radio QPPs for their source regions connected by a group of coronal loops. We propose that the intermittent magnetic reconnecting downward and upward plasmoids may be the possible trigger of both the preflare 3 minute EUV QPPs and the impulsive 2 minute radio QPPs. The other possible mechanism is LRC oscillation, which is associated with the current-carrying coronal loops. The latter mechanism implies that the existence of preflare QPPs may be a possible precursor to solar flares.
资助项目	NSFC[11433006] ; NSFC[11790301] ; NSFC[11661161015] ; NSFC[11573039] ; Science & Technology Facilities Council (STFC)[ST/L000741/1] ; Institute for Space-Earth Environmental Research at Nagoya University ; International Space Science Institute-Beijing (ISSI-BJ)
WOS关键词	RADIO PULSATIONS ; OSCILLATIONS ; MODEL ; EMISSION ; RECONSTRUCTION ; RECONNECTION ; EVOLUTION ; RHESSI ; CORONA ; LOOP
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000471986500004
资助机构	NSFC ; NSFC ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; Institute for Space-Earth Environmental Research at Nagoya University ; Institute for Space-Earth Environmental Research at Nagoya University ; International Space Science Institute-Beijing (ISSI-BJ) ; International Space Science Institute-Beijing (ISSI-BJ) ; NSFC ; NSFC ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; Institute for Space-Earth Environmental Research at Nagoya University ; Institute for Space-Earth Environmental Research at Nagoya University ; International Space Science Institute-Beijing (ISSI-BJ) ; International Space Science Institute-Beijing (ISSI-BJ) ; NSFC ; NSFC ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; Institute for Space-Earth Environmental Research at Nagoya University ; Institute for Space-Earth Environmental Research at Nagoya University ; International Space Science Institute-Beijing (ISSI-BJ) ; International Space Science Institute-Beijing (ISSI-BJ) ; NSFC ; NSFC ; Science & Technology Facilities Council (STFC) ; Science & Technology Facilities Council (STFC) ; Institute for Space-Earth Environmental Research at Nagoya University ; Institute for Space-Earth Environmental Research at Nagoya University ; International Space Science Institute-Beijing (ISSI-BJ) ; International Space Science Institute-Beijing (ISSI-BJ)
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/26565]
专题	中国科学院国家天文台
通讯作者	Chen, Xingyao
作者单位	1.Chinese Acad Sci, CAS Key Lab Solar Act, Natl Astron Observ, Datun Rd 20A, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 3.Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi 4648601, Japan
推荐引用方式 GB/T 7714	Chen, Xingyao,Yan, Yihua,Tan, Baolin,et al. Quasi-periodic Pulsations before and during a Solar Flare in AR 12242[J]. ASTROPHYSICAL JOURNAL,2019,878(2):12.
APA	Chen, Xingyao.,Yan, Yihua.,Tan, Baolin.,Huang, Jing.,Wang, Wei.,...&Masuda, Satoshi.(2019).Quasi-periodic Pulsations before and during a Solar Flare in AR 12242.ASTROPHYSICAL JOURNAL,878(2),12.
MLA	Chen, Xingyao,et al."Quasi-periodic Pulsations before and during a Solar Flare in AR 12242".ASTROPHYSICAL JOURNAL 878.2(2019):12.