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Quasi-Periodic Pulsations Detected in Ly \(\alpha \) and Nonthermal Emissions During Solar Flares

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Abstract

We report quasi-periodic pulsations (QPPs) with double periods during three solar flares (viz. SOL2011-Feb-15T01:44, SOL2011-Sep-25T04:31, SOL2012-May-17T01:25). The flare QPPs were observed from light curves in Ly-\(\alpha \), hard X-ray (HXR), and microwave emissions, with the Ly-\(\alpha \) emission recorded by the Geostationary Operational Environmental Satellite, the HXR emission recorded by the Reuven Ramaty High-Energy Solar Spectroscopic Imager and the Fermi Gamma-ray Burst Monitor, and the microwave emission recorded by the Nobeyama Radio Polarimeters and Radioheliograph. By using the Markov chain Monte Carlo (MCMC) method, QPPs with double periods of about two minutes and one minute were first found in the Ly-\(\alpha \) emission. Then using the same method, a QPP with nearly the same period of about two minutes was also found in HXR and microwave emissions. Considering the possible common origin (nonthermal electrons) between Ly-\(\alpha \) and HXR/microwave emission, we suggest that the two-minute QPP results from the periodic acceleration of nonthermal electrons during magnetic reconnections. The ratio between the double periods in the Ly-\(\alpha \) emission was found to be close to two, which is consistent with the theoretical expectation between the fundamental and harmonic modes. However, we cannot rule out other possible driving mechanisms for the one-minute QPPs in HXR/microwave emissions due to their relatively large deviations.

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Acknowledgments

The authors would like to thank the anonymous reviewer for their valuable comments. We thank the teams of GOES/EUVS, GOES/XRS, RHESSI, AIA, Fermi, NoRP, and NoRH for their open-data use policy. Data courtesy of NASA/SDO and the AIA science team. The Ramaty High Energy Solar Spectroscopic Imager ( RHESSI ) is a NASA small explorer mission. The Nobeyama Radioheliograph and Nobeyama Radio Polarimeters are operated by the Nobeyama Solar Radio Observatory, NAOJ/NINS.) This work is supported by NSFC under grants 12073081, 11973092, 11921003, 11973012, 12103090, U1731241, as well as CAS Strategic Pioneer Program on Space Science, Grant No. XDA15052200, XDA15320103, and XDA15320301. L. Feng also acknowledges the Youth Innovation Promotion Association for financial support. L. Lu and D. Li are also supported by the CAS Key Laboratory of Solar Activity (KLSA202113, KLSA202003). The Laboratory No. 2010DP173032.

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Magnetohydrodynamic (MHD) Waves and Oscillations in the Sun’s Corona and MHD Coronal Seismology

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Lu, L., Li, D., Ning, Z. et al. Quasi-Periodic Pulsations Detected in Ly \(\alpha \) and Nonthermal Emissions During Solar Flares. Sol Phys 296, 130 (2021). https://doi.org/10.1007/s11207-021-01876-4

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