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We observe the motion of cool and hot plasma in a multi-stranded post flareloop system that evolved in the decay phase of a two ribbon M1.0 class flare inAR 11093 on 7 August 2010 using SDO/AIA 304 \AA\ and 171 \AA\ filters. Themoving intensity feature and its reflected counterpart are observed in the loopsystem at multi-temperature. The observed hot counterpart of the plasma thatprobably envelopes the cool confined plasma, moves comparatively faster($\sim$34 km s$^{-1}$) to the later (29 km s$^{-1}$) in form of the spreadedintensity feature. The propagating plasma and intensity reflect from the regionof another footpoint of the loop. The subsonic speed of the moving plasma andassociated intensity feature may be most likely evolved in the post flare loopsystem through impulsive flare heating processes. Complementing ourobservations of moving multi-temperature intensity features in the post flareloop system and its reflection, we also attempt to solve two-dimensional idealmagnetohydrodynamic equations numerically using the VAL-IIIC atmosphere as aninitial condition to simulate the observed plasma dynamics. We consider alocalized thermal pulse impulsively generated near one footpoint of the loopsystem during the flare processes, which is launched along the magnetic fieldlines at the solar chromosphere. The pulse steepens into a slow shock at higheraltitudes while moving along this loop system, which triggers plasmaperturbations that closely exhibit the observed plasma dynamics.

Observations of Post-flare Plasma Dynamics during an M1.0 Flare in AR11093 by SDO/AIA