Sunspot waves and flare energy release
R. Sych, M. Karlick\'y, A. Altyntsev, J. Dud\'ik, L. Kashapova

TL;DR
This study investigates how sunspot waves can trigger and sustain solar flare energy release through wave transformation and magnetic reconnection, supported by multi-wavelength observational data and magnetic field modeling.
Contribution
It demonstrates the role of sunspot wave transformation into transverse oscillations in flare initiation and maintenance, providing new insights into flare dynamics.
Findings
Monotonous energy amplification of 3-min waves before flare
Constant flare emission level indicating ongoing energy release
Detection of 30-sec transverse oscillations in flare loops
Abstract
We address a possibility of the flare process initiation and further maintenance of its energy release due to a transformation of sunspot longitudinal waves into transverse magnetic loop oscillations with initiation of reconnection. This leads to heating maintaining after the energy release peak and formation of a flat stage on the X-ray profile. We applied the time-distance plots and pixel wavelet filtration (PWF) methods to obtain spatio-temporal distribution of wave power variations in SDO/AIA data. To find magnetic waveguides, we used magnetic field extrapolation of SDO/HMI magnetograms. The propagation velocity of wave fronts was measured from their spatial locations at specific times. In correlation curves of the 17 GHz (NoRH) radio emission we found a monotonous energy amplification of 3-min waves in the sunspot umbra before the 2012 June 7 flare. This dynamics agrees with an…
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