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Transverse coronal loop oscillations excited by homologous circular-ribbon flares

文献类型:期刊论文

AuthorZhang, Q. M.1,2,3; Dai, J.1; Xu Z(徐稚)4; Li, D.1; Lu, L.1; Tam, K. V.2; Xu, A. A.2
SourceASTRONOMY & ASTROPHYSICS
Issued Date2020-06-05
Volume638Pages:5
KeywordSun: magnetic fields Sun: flares Sun: corona Sun: oscillations
ISSN0004-6361
DOI10.1051/0004-6361/202038233
Rank第4完成单位
SubtypeArticle
English Abstract

Aims. We report our multiwavelength observations of two homologous circular-ribbon flares in active region 11991 on 2014 March 5, focusing on the transverse oscillations of an extreme-ultraviolet (EUV) loop excited by the flares.Methods. The flares were observed in ultraviolet and EUV wavelengths by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory spacecraft. These flares were also observed in H alpha line center by the 1 m New Vacuum Solar Telescope. Soft X-ray fluxes of the flares in 0.5-4 and 1-8 angstrom were recorded by the GOES spacecraft.Results. The transverse oscillations are of fast standing kink mode. The first-stage oscillation triggered by the C2.8 flare is decayless with lower amplitudes (310-510 km). The periods (115-118 s) in different wavelengths are nearly the same, indicating coherent oscillations. The magnetic field of the loop is estimated to be 65-78 G. The second-stage oscillation triggered by the M1.0 flare is decaying with larger amplitudes (1250-1280 km). The periods decrease from 117 s in 211 angstrom to 70 s in 171 angstrom, implying a decrease of loop length or an implosion after a gradual expansion. The damping time, which is 147-315 s, increases with the period, so that the values of textual-form specific-use="web-only"tau Ptextual-form mml:mfrac tau P mml:mfrac Sare close to each other in different wavelengths. The thickness of the inhomogeneous layer is estimated to be similar to 0 '' .45 under the assumption of resonant absorption.Conclusions. This is the first observation of the excitation of two kink-mode loop oscillations by two sympathetic flares. The results are important to understand the excitation of kink oscillations of coronal loops and hence the energy balance in the solar corona. Our findings also validate the prevalence of significantly amplified amplitudes of oscillations by successive drivers.

Subject天文学 ; 太阳与太阳系 ; 太阳物理学
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Publish Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
Funding ProjectNSFC[11773079] ; NSFC[11790302] ; NSFC[11873091] ; NSFC[11973092] ; International Cooperation and Interchange Program[11961131002] ; Youth Innovation Promotion Association CAS, Yunnan Province Basic Research Plan[2019FA001] ; Science and Technology Development Fund of Macau[275/2017/A] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA202003] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA202006] ; Strategic Priority Research Program on Space Science, CAS[XDA15052200] ; Strategic Priority Research Program on Space Science, CAS[XDA15320301] ; Specialized Research Fund for State Key Laboratories
WOS KeywordTRANSITION-REGION ; MAGNETIC-FIELD ; ALFVEN WAVES ; SEISMOLOGY ; PLASMA ; TRACE ; SUMER
WOS Research AreaAstronomy & Astrophysics
Language英语
PublisherEDP SCIENCES S A
WOS IDWOS:000540423500004
Funding OrganizationNSFC[11773079, 11790302, 11873091, 11973092] ; International Cooperation and Interchange Program[11961131002] ; Youth Innovation Promotion Association CAS, Yunnan Province Basic Research Plan[2019FA001] ; Science and Technology Development Fund of Macau[275/2017/A] ; CAS Key Laboratory of Solar Activity, National Astronomical Observatories[KLSA202003, KLSA202006] ; Strategic Priority Research Program on Space Science, CAS[XDA15052200, XDA15320301] ; Specialized Research Fund for State Key Laboratories
源URL[http://ir.ynao.ac.cn/handle/114a53/23502]  
Collection云南天文台_抚仙湖太阳观测站
Corresponding AuthorZhang, Q. M.
Affiliation1.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, CAS, Nanjing 210033, PR China
2.State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, PR China
3.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, PR China
4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, PR China
Recommended Citation
GB/T 7714
Zhang, Q. M.,Dai, J.,Xu Z,et al. Transverse coronal loop oscillations excited by homologous circular-ribbon flares[J]. ASTRONOMY & ASTROPHYSICS,2020,638:5.
APA Zhang, Q. M..,Dai, J..,Xu Z.,Li, D..,Lu, L..,...&Xu, A. A..(2020).Transverse coronal loop oscillations excited by homologous circular-ribbon flares.ASTRONOMY & ASTROPHYSICS,638,5.
MLA Zhang, Q. M.,et al."Transverse coronal loop oscillations excited by homologous circular-ribbon flares".ASTRONOMY & ASTROPHYSICS 638(2020):5.

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来源:云南天文台

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