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GREGOR observations of a small flare above a sunspot

Published online by Cambridge University Press:  09 September 2016

M. Sobotka ,
J. Dudík ,
C. Denker ,
H. Balthasar ,
J. Jurčák ,
W. Liu  and
the GREGOR Team
M. Sobotka
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic email: msobotka@asu.cas.cz
J. Dudík
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic email: msobotka@asu.cas.cz
C. Denker
Affiliation:
Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 potsdam, Germany
H. Balthasar
Affiliation:
Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 potsdam, Germany
J. Jurčák
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic email: msobotka@asu.cas.cz
W. Liu
Affiliation:
Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic email: msobotka@asu.cas.cz
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Abstract

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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 0.1 nm 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 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−1. Two of them move in the opposite direction and exhibit highly correlated intensity changes, providing evidence for the presence of slipping reconnection at small spatial scales.

Keywords

Sun: flaresSun: chromosphere
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S320: Solar and Stellar Flares and their Effects on Planets , August 2015 , pp. 68 - 73
Copyright
Copyright © International Astronomical Union 2016 

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