On a Signature of a Flux-rope Formation by Vortex Motions in its Footpoint

0398884 - ASÚ 2014 RIV HR eng J - Journal Article
Kotrč, Pavel - Bárta, Miroslav - Kupryakov, Yu. A. - Kashapova, L. K.
On a Signature of a Flux-rope Formation by Vortex Motions in its Footpoint.
Central European Astrophysical Bulletin. Roč. 37, č. 2 (2013), s. 513-520. ISSN 1845-8319.
[Hvar Astrophysical Colloquium /12./. Hvar, 03.09.2012-07.09.2012]
R&D Projects: GA ČR GAP209/10/1680; GA ČR GAP209/10/1706; GA ČR GAP209/12/1652; GA ČR GAP209/12/0103; GA ČR GA13-24782S
Institutional support: RVO:67985815
Keywords : filaments * solar eruptions * magnetic helicity
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics

We analyzed Hα spectrograms and slit-jaw filtergrams of active regions NOAA 10311 and 10314 observed by the Ondřejov flare spectrograph near the western limb on March 19, 2003. Several pre-flares and medium flares C, M, X (according to GOES classification) occurred in this active region during our period of observation. We observed a process of intensive creation of an active region filament. Then the filament changed its contrast in relation to the surrounding chromosphere. From details observed in the filtergrams and spectra we conclude that during this process the filament/flux-rope was twisted by vortex motions in its footpoint. The energy accumulated gradually in the configuration of magnetic field was then released during a series of flares. We discuss the observed phenomena and try to explain them in frame of generally accepted models of physical processes in solar flares.
Permanent Link: http://hdl.handle.net/11104/0226259