Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review)

Quasi-periodic pulsations (or QPPs) are periodic intensity variations in the flare emission that occur across all wavelength bands. In this article, we review the observational and modelling achievements since the previous review on this topic by Nakariakov and Melnikov ( Space Sci. Rev. 149 , 119,...

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Bibliographic Details
Published in:Solar physics 2016-11, Vol.291 (11), p.3143-3164
Main Authors: Van Doorsselaere, Tom, Kupriyanova, Elena G., Yuan, Ding
Format: Article
Language:English
Subjects:
Astrophysics and Astroparticles
Atmospheric Sciences
Emission
Flares
Parameter identification
Physics
Physics and Astronomy
Pulsation
Solar flares
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Stellar flares
Time
Wavelengths
Waves in the Solar Corona
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Summary:Quasi-periodic pulsations (or QPPs) are periodic intensity variations in the flare emission that occur across all wavelength bands. In this article, we review the observational and modelling achievements since the previous review on this topic by Nakariakov and Melnikov ( Space Sci. Rev. 149 , 119, 2009 ). In recent years, it has become clear that QPPs are an inherent feature of solar flares because almost all flares exhibit QPPs. Moreover, it is now firmly established that QPPs often show multiple periods. We also review possible mechanisms for generating QPPs. Up to now, it has not been possible to conclusively identify the triggering mechanism or cause of QPPs. The lack of this identification currently hampers possible seismological inferences of flare plasma parameters. QPPs in stellar flares have been detected for a long time, and the high-quality data of the Kepler mission allows studying the QPP more systematically. However, it has not been conclusively shown whether the timescales of stellar QPPs are different or the same as those in solar flares.
ISSN:0038-0938
1573-093X
DOI:10.1007/s11207-016-0977-z