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Fig. 1

image

Time sequence of AIA images at 1600 Å observed in AR 11324 during the flare on October 22, 2011. The field of view is x ≃ [−450,−250] ′′ and y ≃ [0,200] ′′. Panel a shows brightenings observed prior to the null-point reconnection. In panels b and c are identified the three main ribbons related to null-point reconnection: quasi-circular, inner, and outer ribbons associated with the fan, and the inner and outer spine separatrix footpoints. Inpanel d R1, R2, and R3 denote the three brightest segments along the quasi-circular ribbon. Panels e and f show the decaying phase of the flare. The full temporal evolution is available in an online movie (which has not been corrected for solar rotation) that also shows the AIA sequence in the 131 Å and 171 Å channels.

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