DYNAMIC PROCESSES IN AN ACTIVE REGION IN THE INITIAL AND IMPULSIVE PHASE OF THE ERUPTIVE FLARE EVENT ON JUNE 7, 2011
We present the results of an analysis of Hα monochromatic and spectral observations of an impressive ﬁlament eruption during the eruptive ﬂare on June 7, 2011 obtained at the Crimean Astrophysical Observatory. Our ground- based observations are combined with data acquired by multiple instruments onboard the Solar Dynamics Observatory (SDO/AIA, SDO/HMI). The evolution and dynamics of the eruptive process, the cause of eruption, the structure of the line-of-sight velocity ﬁeld and ﬁne internal structure of the eruptive ﬁlament are studied and a number of physical parameters in the eruptive ﬁlament are determined. The results of the analysis have shown that: 1) The evolution of the ﬁlament eruption consists of two phases: the slow-rise phase, which began about two hours before the ﬂare onset, and the fast-rise phase, which began almost simultaneously with the start of the ﬂare. 2) The eruptive ﬁlament had a very complex internal structure and complicated line-of-sight velocity ﬁeld. The ﬁlament does not erupt as a single structure. Several discrete massive absorption fragments are seen with a large number of ﬁne-structured elements inside fragments with diﬀerent velocities, as well as many plasma blobs that detach from the fragments. 3) The movement of the ﬁlament fragments is a combination of rotational movement around the axis of the main fragment and a bulk motion towards the observer as they erupt. The velocities of such plasma movements are determined. 4) Hα line proﬁles show a large variety of contrast values, Doppler half-widths and Doppler shifts in eruptive ﬁlament elements.