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Observations of a Quasi-periodic Pulsation in the Coronal Loop and Microwave Flux during a Solar Preflare Phase
Li Dong1,2,3; Li Ying1; Lu Lei1; Zhang Qingmin1,4; Ning Zongjun1; Anfinogentov, Sergey5
2020-04-10
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume893Issue:1Pages:6
Abstract

We report a quasi-periodic pulsation (QPP) event simultaneously detected from the spatial displacements of the coronal loop at both EUV images and microwave emission during the preflare phase of a C1.1 flare on 2016 March 23. Using the motion magnification technique, a low-amplitude transverse oscillation with the growing period is discovered in a diffuse coronal loop in Atmospheric Imaging Assembly (AIA) image sequences at wavelength of 171 A, and the initial oscillation period is estimated to be similar to 397 s with a slow growth rate of 0.045. At the same time, a QPP with growing periods from roughly 300 s to nearly 500 s is discovered in the microwave flux in the same active region. Based on the imaging observations measured at EUV wavelengths by the AIA and at microwave 17 GHz by Nobeyama Radioheliograph, the diffuse coronal loop and the microwave radiation source are found to be connected through a hot loop seen in AIA images at wavelength of 94 A. The growing period of the QPP should be related to the modulation of LRC-circuit oscillating process in a current-carrying plasma loop. The existence of electric currents may imply the non-potentialities in the source region during the preflare phase.

KeywordSolar flares Solar oscillations Solar ultraviolet emission Solar radio emission
DOI10.3847/2041-8213/ab830c
WOS KeywordTRANSITION-REGION ; OSCILLATIONS ; FLARE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000526405400001
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/36027
Collection中国科学院紫金山天文台
Corresponding AuthorLi Dong
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210033, Peoples R China
2.Chinese Acad Sci, State Key Lab Space Weather, Beijing 100190, Peoples R China
3.Natl Astron Observ, CAS Key Lab Solar Act, Beijing 100012, Peoples R China
4.Macau Univ Sci & Technol, State Key Lab Lunar & Planetary Sci, Macau, Peoples R China
5.Inst Solar Terr Phys ISZF, Lermontov St 26a, Irkutsk 664033, Russia
Recommended Citation
GB/T 7714
Li Dong,Li Ying,Lu Lei,et al. Observations of a Quasi-periodic Pulsation in the Coronal Loop and Microwave Flux during a Solar Preflare Phase[J]. ASTROPHYSICAL JOURNAL LETTERS,2020,893(1):6.
APA Li Dong,Li Ying,Lu Lei,Zhang Qingmin,Ning Zongjun,&Anfinogentov, Sergey.(2020).Observations of a Quasi-periodic Pulsation in the Coronal Loop and Microwave Flux during a Solar Preflare Phase.ASTROPHYSICAL JOURNAL LETTERS,893(1),6.
MLA Li Dong,et al."Observations of a Quasi-periodic Pulsation in the Coronal Loop and Microwave Flux during a Solar Preflare Phase".ASTROPHYSICAL JOURNAL LETTERS 893.1(2020):6.
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