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Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares
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A phenomenological relationship between oscillations in a sunspot and quasi-periodic pulsations in flaring energy releases at an active region 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 active region. 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 quasi-periodic pulsations in the flaring energy releases can be triggered by 3-min slow magnetoacoustic waves leaking from sunspots.
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The Study of Quasi-Periodic Pulsations in Solar and Stellar Flares with SKA
SKA’s radio imaging spectroscopy and polarisation will enable decisive tests of QPP mechanisms in solar and stellar flares, including weak events and solar–stellar comparisons.
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