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.
@article{arxiv.1005.3594,
title = {Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares},
author = {R. Sych and V. M. Nakariakov and M. Karlicky and S. Anfinogentov},
journal= {arXiv preprint arXiv:1005.3594},
year = {2015}
}