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In this letter, we study in detail the evolution of the post-flare loops on2005 January 15 that occurred between two consecutive solar eruption events,both of which generated a fast halo CME and a major flare. The post-flare loopsystem, formed after the first CME/flare eruption, evolved rapidly, asmanifested by the unusual accelerating rise motion of the loops. Throughnonlinear force-free field (NLFFF) models, we obtain the magnetic structureover the active region. It clearly shows that the flux rope below the loopsalso kept rising accompanied with increasing twist and length. Finally, thepost-flare magnetic configuration evolved to a state that resulted in thesecond CME/flare eruption. This is an event in which the post-flare loops canre-flare in a short period of $\sim$16 hr following the first CME/flareeruption. The observed re-flaring at the same location is likely driven by therapid evolution of the flux rope caused by the magnetic flux emergence and therotation of the sunspot. This observation provides valuable information onCME/flare models and their prediction.

Re-flaring of a Post-Flare Loop System Driven by Flux Rope Emergence and Twisting