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Quasi-periodic pulsations with periods that change depending on whether the pulsations have thermal or nonthermal components
Li, D.1,2; Zhang, Q. M.1; Huang, Y.1; Ning, Z. J.1; Su, Y. N.1
2017
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume597Pages:4
Corresponding AuthorLi, D.(lidong@pmo.ac.cn)
AbstractContext. Quasi-periodic pulsations (QPPs) typically display periodic and regular peaks in the light curves during the flare emissions. Sometimes, QPPs show multiple periods at the same wavelength. However, changing periods in various channels are rare. Aims. We report QPPs in a solar flare on 2014 October 27. They showed a period change that depended on whether thermal or nonthermal components were included. The flare was simultaneously observed by many instruments. Methods. Using the fast Fourier transform (FFT), we decomposed the light curves at multiple wavelengths into slowly varying and rapidly varying signals. Then we identified the QPPs as the regular and periodic peaks from the rapidly varying signals. The periods are derived with the wavelet method and confirmed based on the FFT spectra of the rapidly varying signals. Results. We find a period of similar to 50 s from the thermal emissions during the impulsive phase of the flare, that is, in the soft X-ray bands. At the same time, a period of about 100 s is detected from the nonthermal emissions, such as hard X-ray and microwave channels. The period ratio is exactly 2.0, which might be due to the modulations of the magnetic reconnection rate by the fundamental and harmonic modes of magnetohydrodynamic waves. Our results further show that the similar to 100 s period is present over a broad wavelength, such as hard X-rays, extreme-UV/UV, and microwave emissions, indicating the periodic magnetic reconnection in this flare. Conclusions. To our knowledge, this is the first report about period changes from thermal to nonthermal components in a single flare that occur at almost the same time. This new observational finding could be a challenge to the theory of flare QPPs.
KeywordSun: flares Sun: oscillations Sun: radio radiation Sun: UV radiation Sun: X-rays, gamma rays
DOI10.1051/0004-6361/201629867
WOS KeywordCORONAL LOOP OSCILLATIONS ; SOLAR-FLARE LOOPS ; REGION-IMAGING-SPECTROGRAPH ; X-CLASS FLARE ; MAGNETIC RECONNECTION ; RADIO PULSATIONS ; TIME-SERIES ; SIGNATURE ; EMISSION ; WAVES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000392392900141
PublisherEDP SCIENCES S A
Citation statistics
Cited Times:11[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23310
Collection中国科学院紫金山天文台
Corresponding AuthorLi, D.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Sci, Nanjing 210008, Jiangsu, Peoples R China
2.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Li, D.,Zhang, Q. M.,Huang, Y.,et al. Quasi-periodic pulsations with periods that change depending on whether the pulsations have thermal or nonthermal components[J]. ASTRONOMY & ASTROPHYSICS,2017,597:4.
APA Li, D.,Zhang, Q. M.,Huang, Y.,Ning, Z. J.,&Su, Y. N..(2017).Quasi-periodic pulsations with periods that change depending on whether the pulsations have thermal or nonthermal components.ASTRONOMY & ASTROPHYSICS,597,4.
MLA Li, D.,et al."Quasi-periodic pulsations with periods that change depending on whether the pulsations have thermal or nonthermal components".ASTRONOMY & ASTROPHYSICS 597(2017):4.
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