a) AIA 304 Å image showing the positions of the dark filaments before the flare, “f1” and “f2”; b) snapshot of the flare event SOL2011-09-06T22:20 in the AIA 131 Å filter before the flare onset. In this filter, corresponding to a coronal plasma of 10 MK, an intense bright structure made of S- and/or J-shaped loops appears, referred to as a sigmoid, and is indicative of the presence of a flux rope. c) An image in the 304 Å AIA filter, corresponding to a coronal plasma of 50 000 K, shows the flare ribbons at 22:17 UT. The ribbons first appear in the region where the brightened sigmoid is observed before the flare, while another ribbon extends in a circular shape to the north of the PIL. d) A 304 Å image shows the first filament eruption (f1) that displays some twist. e) The 335 Å filter shows the flare loops above the PIL and a strong dimming in the faculae region, surrounded by a faint remote flare ribbon. The flare loops appear after the onset of the flare and are mostly localized above the frontier between the strong positive polarity and negative polarity region shown in Fig. 2. f) This snapshot in AIA 171 Å shows the second, jet-like-shaped eruption of filament part f2, 16 min after the first eruption. An accompanying movie showing the region in different filters is available online.
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