GREGOR observations of a small flare above a sunspot

0488874 - ASÚ 2018 RIV GB eng C - Konferenční příspěvek (zahraniční konf.)
Sobotka, Michal - Dudík, Jaroslav - Denker, C. - Balthasar, H. - Jurčák, Jan - Liu, Wenjuan
GREGOR observations of a small flare above a sunspot.
Solar and Stellar Flares and their Effects on Planets. Cambridge: Cambridge University Press, 2016, s. 68-73. Proceedings of the International Astronomical Union, IAU S320. ISBN 9781107137578.
[Symposium of the International Astronomical Union /320./. Honolulu (US), 11.08.2015-14.08.2015]
Grant CEP: GA MŠMT(CZ) 7E13003
Klíčová slova: Sun * flares * chromosphere
Obor OECD: Astronomy (including astrophysics,space science)

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 1.5m 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. Light curves and horizontal velocities of small-scale bright knots in the observed flare ribbon were measured. 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.

Trvalý link: http://hdl.handle.net/11104/0283393