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Preflare very long-periodic pulsations observed in H alpha emission before the onset of a solar flare
Alternative TitleWOS:000552060400003;20203008977880
Li, Dong1,2; Feng, Song3; Su, Wei4; Huang, Yu
Source PublicationASTRONOMY & ASTROPHYSICS
2020
Volume639Pages:L5
DOI10.1051/0004-6361/202038398
ISSN0004-6361
Language英语
KeywordSun: flares Sun: oscillations Sun: chromosphere Sun: UV radiation Sun: X-rays gamma rays CORONAL LOOP OSCILLATIONS RAY EMISSION MICROWAVE SIGNATURE DYNAMICS PLASMA WAVES SUMER
AbstractContext. Very long-periodic pulsations during preflare phases (preflare-VLPs) have been detected in the full-disk solar soft X-ray (SXR) flux. They may be regarded as precursors to solar flares and may help us better understand the trigger mechanism of solar flares.Aims. In this Letter, we report a preflare-VLP event prior to the onset of an M1.1 circular-ribbon flare on 2015 October 16. It was simultaneously observed in H alpha, SXR, and extreme ultraviolet (EUV) wavelengths.Methods. The SXR fluxes in 1-8 angstrom and 1-70 angstrom were recorded by the Geostationary Operational Environmental Satellite (GOES) and Extreme Ultraviolet Variability Experiment, respectively; the light curves in H alpha and EUV 211 angstrom were integrated over a small local region, which were measured by the 1 m New Vacuum Solar Telescope and the Atmospheric Imaging Assembly (AIA), respectively. The preflare-VLP is identified as the repeat and quasi-periodic pulses in light curves during preflare phase. The quasi-periodicity can be determined from the Fourier power spectrum with Markov chain Monte Carlo-based Bayesian.Results. Seven well-developed pulses are found before the onset of an M1.1 circular-ribbon flare. They are firstly seen in the local light curve in H alpha emission and then discovered in full-disk SXR fluxes in GOES 1-8 angstrom and ESP 1-70 angstrom, as well as the local light curve in AIA 211 angstrom. These well-developed pulses can be regarded as the preflare-VLP, which might be modulated by LRC-circuit oscillation in the current-carrying plasma loop. The quasi-period is estimated to be similar to 9.3 min.Conclusions. We present the first report of a preflare-VLP event in the local H alpha line and EUV wavelength, which could be considered a precursor of a solar flare. This finding should therefore prove useful for the prediction of solar flares, especially for powerful flares.
Indexed BySCI ; EI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7703
Collection中国科学院国家空间科学中心
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 100101, Peoples R China
4.Kunming Univ Sci & Technol, Fac Informat Engn & Automat, Yunnan Key Lab Comp Technol Applicat, Kunming 650500, Yunnan, Peoples R China
5.Huazhong Univ Sci & Technol, MOE Key Lab Fundamental Phys Quant Measurements, Sch Phys, Wuhan 430074, Peoples R China
Recommended Citation
GB/T 7714
Li, Dong,Feng, Song,Su, Wei,et al. Preflare very long-periodic pulsations observed in H alpha emission before the onset of a solar flare[J]. ASTRONOMY & ASTROPHYSICS,2020,639:L5.
APA Li, Dong,Feng, Song,Su, Wei,&Huang, Yu.(2020).Preflare very long-periodic pulsations observed in H alpha emission before the onset of a solar flare.ASTRONOMY & ASTROPHYSICS,639,L5.
MLA Li, Dong,et al."Preflare very long-periodic pulsations observed in H alpha emission before the onset of a solar flare".ASTRONOMY & ASTROPHYSICS 639(2020):L5.
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