Flare signatures observed by SDO/AIA on 2012 October 16 at 1600 Å (left), at 304 Å (middle), and at 171 Å (right). The black arrow indicates the northern direction. The white square indicates the field of view of Fig. 4. The temporal evolution of AIA 1600 Å, 304 Å, and 171 Å images is available as a movie in the online edition.
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