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We report the simultaneous extreme ultraviolet observation of magneticreconnection inflow and outflow in a flare on 2010 August 18 observed by theAtmospheric Imaging Assembly on board the {\it Solar Dynamics Observatory}. Wefound that during the rise phase of the flare, some plasma blobs appeared inthe sheet structure above the hot loops. The plasma blobs were ejectedbidirectionally along the sheet structure (outflow), at the same time as thethreads visible in extreme ultraviolet images moved toward the sheet structure(inflow). The upward and downward ejection velocities are 220-460 km s$^{-1}$and 250-280 km s$^{-1}$, respectively. The inflow speed changed from 90 kms$^{-1}$ to 12 km s$^{-1}$ in 5 minutes. By using these velocities, weestimated the nondimensional reconnection rate, which we found to vary duringthis period from 0.20 to 0.055. We also found that the plasma blobs in thesheet structure collided or merged with each other before they were ejectedfrom the sheet structure. We hypothesize that the sheet structure is thecurrent sheet and that these plasma blobs are plasmoids or magnetic islands,which could be important for understanding the dynamics of the reconnectionregion.

Simultaneous Observation of Reconnection Inflow and Outflow Associated with the 2010 August 18 Solar Flare