Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares

By R. Sych, Valery M. Nakariakov, M. Karlický, S. Anfinogentov. 2009

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A phenomenological relationship between oscillations in a sunspot and quasi-periodic pulsations (QPP) in flaring energy releases at an active region (AR) above the sunspot is established. The analysis of the microwave emission recorded by the Nobeyama Radioheliograph at 17 GHz shows a gradual increase in the power of the 3-min oscillation train in the sunspot associated with AR 10756 before flares in this AR. The flaring light curves are found to be bursty with a period of 3 min. Our analysis of the spatial distribution of the 3-min oscillation power implies that the oscillations follow from sunspots along coronal loops towards the flaring site. It is proposed that QPP in the flaring energy releases can be triggered by 3-min slow magnetoacoustic waves leaking from sunspots.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/3570a8facae5f2a469efc2420b51c3bccd9eb7ae

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Citations in the corpus

Quasi-periodic Pulsations in Solar and Stellar Flares: An Overview of Recent Results (Invited Review) (2016, background): “The period of about 3 minutes corresponds to the periods of the sunspot’s oscillations, and some observational evidence has been found for a link (Sych et al., 2009).”
Advances in Observing Various Coronal EUV Waves in the SDO Era and Their Seismological Applications (Invited Review) (2014, unknown): “SOLA: ms.tex; 7 May 2014; 7:04; p. 28 Proposed mechanisms for flare QPPs (see Nakariakov and Melnikov, 2009 for a review) fall into two categories: pulsed energy release intrinsic to magnetic reconnection and MHD oscillations, both relevant to the generation of QFP wave trains (Liu et al., 2011; She”
Decaying and decayless transverse oscillations of a coronal loop (2013, result): “A possible source can be thought to be the sunspot oscillations, which would be consistent with the empirically established relationship between three min oscillations in solar flares (Sych et al. 2009).”
Magnetohydrodynamic Oscillations in the Solar Corona and Earth’s Magnetosphere: Towards Consolidated Understanding (2016, background): “Chromospheric 3-min oscillations were found to modulate impulsive flaring energy releases (Sych et al. 2009).”
Decayless low-amplitude kink oscillations: a common phenomenon in the solar corona? (2015, background): “The periods of decayless kink oscillations have been observed in the range that includes 3 and 5 minutes (Anfinogentov et al. 2013), which could be associated with sunspot oscilla- Article number, page 4 of 9 tions leaking into the corona (Sych et al. 2009).”
Modelling Quasi-Periodic Pulsations in Solar and Stellar Flares (2018, background): “In addition, this mechanism could readily explain the observed association of QPPs of the microwave emission in solar flares with the slow magnetoacoustic waves leaking from a sunspot in the corona (Sych et al. 2009).”
Oscillations and Waves in Sunspots (2015, methodology): “However, using data recorded by the Nobeyama Radioheliograph at 17 GHz, Sych et al. (2009) measured a gradual increase in the power of the 3-min oscillations in a sunspot just before bursty flares with a period of 3 minutes took place.”