Main Objective: Co-observations of active region filaments and complex neutral lines with GREGOR, SST, IRIS, LOFAR
Scientific Justification: Active region filaments form along the magnetic neutral line, which separates areas with opposite magnetic fields within active regions. Almost all (94%) earth-directed CMEs are associated with eruptive filaments and 79% of the CMEs are initiated from within an active region (Zhou et al. 2003, A&A 397, 1057). Changes of the 3-D photospheric flow field can be related to activated filaments, which show a distinct upward motion, i.e., a blue-shifted component in Hα. Thus, understanding formation, evolution, and dynamics of such filaments will reveal mechanisms, which serve as triggers and are thus relevant for space weather forecasts and prediction of CMEs. |
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