首页|Quasi-periodic pulsations with double periods observed in Lyα emission during solar flares

Quasi-periodic pulsations with double periods observed in Lyα emission during solar flares

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Quasi-periodic pulsations (QPPs) are very common oscillation features during solar flares,which have been observed in almost the entire wavelengths.However,the flare-related QPPs with double periods in the Lyα emission,particularly within a period ratio of about 2,were rarely detected.In this paper,we report the QPPs with double periods in the full-disk Lyα emission during the impulsive phase of four solar flares,i.e.,SOL2016-Feb-12,SOL2014-Oct-24,SOL2014-Jun-10,and SOL2012-Nov-21.The full-disk Lyα fluxes were recorded by the extreme-ultraviolet sensor on board the Geostationary Operational Environmental Satellite.Then,the quasi-periods are estimated by the Markov chain Monte Carlo (MCMC) sampling techniques.Finally,the double periods of around 3 and 1.5 min are detected in Lyα emissions,and their period ratio is roughly equal to 2.The 3-min QPP could also be detected in the local light curves measured by the Atmospheric Imaging Assembly at wavelengths of 304 and 1600 ～.Our observations suggest that the double periodic QPPs could be regarded as the fundamental and harmonic modes of acoustic waves,which should be helpful to understand magnetohydrodynamic waves in the solar chromosphere.However,we cannot rule out that the double periods are each caused by a different generation mechanism.

solar flaressolar chromosphereoscillationsUV radiationmagnetohydrodynamics (MHD)

LI Dong

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Key Laboratory of Dark Matter and Space Astronomy,Purple Mountain Observatory,Chinese Academy of Sciences,Nanjing 210033,China

CAS Key Laboratory of Solar Activity,National Astronomical Observatories,Beijing 100101,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Pioneer Program on Space Science of Chinese Academy of SciencesStrategic Pioneer Program on Space Science of Chinese Academy of SciencesCAS Key Laboratory of Solar ActivityCAS Key Laboratory of Solar Activity

1197309212073081118730951179030211729301XDA15052200XDA15320301KLSA2020032010DP173032

2022

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDCSCDSCIEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2022.65(1)
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