Abstract
We follow the evolution (flare activity, filament formation) of two interacting active regions of different ages over three days, through observations at white-light, Hα, UV, and X-ray wavelengths. We show that the observed photospheric motions could generate DC electric currents and that they could lead to free energy storage. Flares were observed more-or-less simultaneously in remote locations of the sunspot group. This suggests that the same perturbation affected an ensemble of lines of force. Filament formation took place due to DC current generation by photospheric shearing motions with a velocity up to 350 m s −1.
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