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| Observations of a Quasi-periodic Pulsation in the Coronal Loop and Microwave Flux during a Solar Preflare Phase | |
| Alternative Title | WOS:000526405400001 |
| Li Dong1,2; Li Ying; Lu Lei; Zhang Qingmin3; Ning Zongjun; Anfinogentov, Sergey4 | |
| Source Publication | ASTROPHYSICAL JOURNAL LETTERS
 |
| 2020 | |
| Volume | 893Issue:1Pages:L17 |
| DOI | 10.3847/2041-8213/ab830c |
| ISSN | 2041-8205 |
| Language | 英语 |
| Keyword | Solar flares Solar oscillations Solar ultraviolet emission Solar radio emission TRANSITION-REGION OSCILLATIONS FLARE |
| 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. |
| Indexed By | SCI |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/7590 |
| Collection | 中国科学院国家空间科学中心 |
| Affiliation | 1.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):L17. |
| 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),L17. |
| 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):L17. |
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