Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations

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 one to ten minutes) oscillations in sunspots reflect prop...

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Veröffentlicht in:Solar physics 2011-11, Vol.273 (2), p.403-412
Hauptverfasser: Abramov-Maximov, V. E., Gelfreikh, G. B., Shibasaki, K.
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container_title Solar physics
container_volume 273
creator Abramov-Maximov, V. E.
Gelfreikh, G. B.
Shibasaki, K.
description 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 one to ten 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 et al. ( Astron. Astrophys. 505 , 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 sunspots and flare processes.
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subjects Astrophysics and Astroparticles
Atmospheric Sciences
Corona
Energy storage
Energy Storage and Release–Models Meet Radio Observations
Flares
Joints
Magnetic fields
Magnetohydrodynamics
MHD
Oscillations
Physics
Physics and Astronomy
Radio astronomy
Solar activity
Solar flares
Solar physics
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Sunspots
Wave propagation
title Quasi-periodic Oscillations of Solar Active Regions in Connection with Their Flare Activity – NoRH Observations
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