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Solar Physics

, Volume 291, Issue 11, pp 3143–3164 | Cite as

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

  • Tom Van Doorsselaere
  • Elena G. Kupriyanova
  • Ding Yuan
Waves in the Solar Corona

Abstract

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.

Keywords

Flares, dynamics Flares, waves Oscillations, solar Oscillations, stellar Coronal seismology 

Notes

Acknowledgements

Inspiration for this review was obtained during ISSI and ISSI-BJ workshops. TVD thanks the Odysseus type II funding (FWO-Vlaanderen), IAP P7/08 CHARM (Belspo), GOA-2015-014 (KU Leuven). EK is a beneficiary of a mobility grant from Belspo.

Disclosure of Potential Conflicts of Interest

The authors declare that they have no conflicts of interest.

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© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Centre for mathematical Plasma Astrophysics, Department of MathematicsKU LeuvenLeuvenBelgium
  2. 2.Central Astronomical Observatory at Pulkovo of the Russian Academy of SciencesSt. PetersburgRussia
  3. 3.Jeremiah Horrocks InstituteUniversity of Central LancashirePrestonUK

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