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Michal Sobotka, Mr. - Dr. |
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Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech
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Session 1 - Speaker |
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Slipping reconnection in a solar flare observed with GREGOR |
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M. Sobotka (1), J. Dudík (1), C. Denker (2), H. Balthasar (2), J. Jurčák (1), W. Liu (1), and the GREGOR Team;
1 - Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech
Republic; 2 - Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany |
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A small flare ribbon above a sunspot umbra in active region 12205 was
observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5-m
GREGOR telescope, using a 1 A Ca II H interference filter. Context observations from
SDO/AIA, Hinode/SOT, and IRIS show that the ribbon is a part of a larger one that
extends through the neighboring positive polarities and also participates in several
other flares within the active region. A 140 second long time series of Ca II H
images was reconstructed by means of the Multi-Frame Blind Deconvolution method,
giving the respective spatial and temporal resolutions of 0.1 arcsec and 1 s. Light
curves and horizontal velocities of small-scale bright knots in the observed flare
ribbon were measured. Some knots are stationary but three move along the ribbon with
speeds of 7 - 11 km/s. Two of them move in the opposite direction and exhibit highly
correlated intensity changes, providing evidence for the presence of slipping
reconnection. |
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