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Fig. 2

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a), b) AIA 171 and 304 Å images before the onset of the first flare (B6.0). On these images are overlaid the HMI magnetogram contours of positive (white) and negative (black) polarities. The contour levels are ±500, ±1000, and ±1500 gauss. The rectangular (white) box indicates the size of the middle and bottom panels. P1 and N1 are positive and negative polarity sunspots. c), d) AIA 171 and 1600 Å images showing the preflare brightening between N1 and P1. e)–h) The heated loop was observed in the cool (304, 171, and 1600 Å) and hot (AIA 131 Å) channels. S1 indicates the slice cut (over the footpoint of the loop) used to create the stack plot. The arrowhead shows the direction of the slice. The x- and y-axes are labeled in arcsecs. The evolution of this flare is shown in an animation (i.e., AIA 171, 304, and 131 Å, bottom panels) available online.

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