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Fig. 1.


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Depiction of the AR 12241 magnetogram, the formation and rising motion of the flux rope, and the parallel flare ribbons. Panel a illustrates the HMI vector magnetogram of AR 12241 at 21:24 UT on 2014 December 18. The grey-scale image is the vertical field, with the strength given by the colour bar. The red and blue arrows show the strength and direction of the transverse magnetic field, while the green lines mark the PILs. Panels b–d illustrate the flux rope formation, marked by the red arrow in panel b and its rising motion denoted by red arrows in panels c and d in 131 Å. The brightenings moving eastward are marked by yellow arrows in panels c and d. Panels e and f depict the parallel flare ribbons in 304 Å. Also, note the isolated brightenings in 304 Å (green arrows). Similar to 304 Å, the parallel ribbons and the isolated brightenings are observed in 1600 Å, as shown in panels g and h, where the red arrows mark the isolated brightenings. North is upward, and east is to the left in this and all other solar images in this paper. The animations for panels b and e are available online.

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