ИСТИНА

We analyzed H-alpha spectrograms and slit-jaw filtergrams of active regions NOAA 10311 and 10314 observed by the Ondrejov flare spectrograph near the western limb on March 19, 2003. Several pre-flares and medium flares (C, M ,X) 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 spinning 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.