Quasi-periodic Pulsation Detected in Lyα Emission During Solar Flares
Li,Dong1,2,3; Lu,Lei1; Ning,Zongjun1; Feng,Li1; Gan,Weiqun1; Li,Hui1
Source PublicationThe Astrophysical Journal
AbstractAbstract We investigated the quasi-periodic pulsation (QPP) in Lyα, X-ray, and extreme-ultraviolet (EUV) emissions during two solar flares, i.e., an X-class (SOL2012-01-27T) and a C-class (SOL2016-02-08T). The full-disk Lyα and X-ray flux during these solar flares were recorded by the EUV Sensor and X-Ray Sensor on board the Geostationary Operational Environmental Satellite. The flare regions were located from the EUV images measured by the Atmospheric Imaging Assembly. The QPP could be identified as a series of regular and periodic peaks in the light curves, and its quasi-periodicity was determined from the global wavelet and Fourier power spectra. A quasi-periodicity at about 3?minutes is detected during the impulsive phase of the X-class flare, which could be explained as the acoustic wave in the chromosphere. Interestingly, a quasi-periodicity at roughly 1?minute is discovered during the entire evolutionary phases of solar flares, including the precursor, impulsive, and gradual phases. This is the first report of 1 minute QPP in the Lyα emission during solar flares, in particular during the flare precursor. It may be interpreted as a self-oscillatory regime of the magnetic reconnection, such as magnetic dripping.
KeywordSolar flares Solar oscillations Solar chromosphere Solar ultraviolet emission Solar x-ray emission
WOS IDIOP:0004-637X-893-1-ab7cd1
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, CAS, Nanjing 210033, People’s Republic of China;,
2.State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
3.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100101, People’s Republic of China
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Li,Dong,Lu,Lei,Ning,Zongjun,et al. Quasi-periodic Pulsation Detected in Lyα Emission During Solar Flares[J]. The Astrophysical Journal,2020,893(1).
APA Li,Dong,Lu,Lei,Ning,Zongjun,Feng,Li,Gan,Weiqun,&Li,Hui.(2020).Quasi-periodic Pulsation Detected in Lyα Emission During Solar Flares.The Astrophysical Journal,893(1).
MLA Li,Dong,et al."Quasi-periodic Pulsation Detected in Lyα Emission During Solar Flares".The Astrophysical Journal 893.1(2020).
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