Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations

Details Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations

2011-07-08

arxiv.org/abs/1107.1620v1

Solar Physics, Volume 273, Number 2, pp.403-412, 2011

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 6 figures. Accepted for publication in Solar Physics (7 Jul 2011). The final publication is available at http://www.

Scientific paper

10.1007/s11207-011-9822-6

The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B=2000 G at the level of the chromosphere-corona transition region. The observations of short period (from 1 to 10 minutes) oscillations in sunspots reflect propagation of magnetohydrodynamic (MHD) waves in the magnetic flux tubes of the sunspots. We investigate the oscillation parameters in active regions in connection with their flare activity. We confirm the existence of a link between the oscillation spectrum and flare activity. We find differences in the oscillations between pre-flare and post-flare phases. In particular, we demonstrate a case of powerful three-minute oscillations that start just before the burst. This event is similar to the cases of the precursors investigated by Sych, R. et al. (Astron. Astrophys., vol.505, p.791, 2009). We also found well-defined eight-minute oscillations of microwave emission from sunspot. We interpret our observations in terms of a relationship between MHD waves propagating from sunspot and flare processes.

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