Sunspot waves and flare energy release

0444688 - ASÚ 2016 RIV FR eng J - Journal Article
Sych, R.A. - Karlický, Marian - Altyntsev, A. - Dudík, Jaroslav - Kashapova, L. K.
Sunspot waves and flare energy release.
Astronomy & Astrophysics. Roč. 577, May (2015), A43/1-A43/8. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR GAP209/12/0103; GA ČR GAP209/12/1652
Grant - others:EC(XE) 606862
Program: FP7
Institutional support: RVO:67985815
Keywords : Sun flares * Sun oscillations * Sun X-rays
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.185, year: 2015

We analysed the sunspot 3-min wave dynamics and found a correlation between the oscillation power amplification and flare triggering in the region connected to the sunspot through the magnetic channel. We propose that this amplified wave flux triggered the flare. The flare occurred because of this amplified flux, however, and because a sufficient amount of free magnetic energy was accumulated in close vicinity to the magnetic channel prior to the flare. Furthermore, because of loop heating, the wave velocity (sound velocity) increased with the penetration of waves into the energy release site. The heating is shown to be able to proceed after the flare main peak owing to a further energy pumping in the form of waves from the sunspot and additional reconnection episodes in the flare region.
Permanent Link: http://hdl.handle.net/11104/0247200