Journal
ASTRONOMY & ASTROPHYSICS
Volume 505, Issue 2, Pages 791-799Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200912132
Keywords
waves; magnetohydrodynamics (MHD)
Categories
Funding
- Royal Society UK-Russian International Joint Project [300030701]
- Czech Academy of Sciences
- RFBR [08-02-13633ofi-c, 08-02-91860-KO-a, 08-02-92204-GFEN-a]
- Engineering and Physical Sciences Research Council [EP/D062837/1, EP/H02395X/1] Funding Source: researchfish
- Science and Technology Facilities Council [ST/F00205X/1] Funding Source: researchfish
- EPSRC [EP/D062837/1, EP/H02395X/1] Funding Source: UKRI
- STFC [ST/F00205X/1] Funding Source: UKRI
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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.
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