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Using high spatial and temporal data from the \emph{Solar DynamicsObservatory} (\emph{SDO}) and the \emph{Interface Region Imaging Spectrograph}(\emph{IRIS}), several observational signatures of magnetic reconnection in thecourse of magnetic flux cancellation are presented, including two loop-loopinteraction processes, multiple plasma blob ejections, and a sheet-likestructure that appeared above the flux cancellation sites with a Y-shaped andan inverted Y-shaped ends. The \emph{IRIS} 1400 \AA\ observations show that theplasma blobs were ejected from the tip of the Y-shaped ends of the sheet-likestructure. Obvious photospheric magnetic flux cancellation occurred after thefirst loop-loop interaction and continued until the end of the observation.Complemented by the nonlinear force-free field extrapolation, we found that twosets of magnetic field lines, which reveal an X-shaped configuration, alignwell with the interacted coronal loops. Moreover, a magnetic null point isfound to be situated at about $0.9$ Mm height right above the flux cancellationsites and located between the two sets of magnetic field lines. These resultssuggest that the flux cancellation might be a result of submergence of magneticfield lines following magnetic reconnection that occurs in the lower atmosphereof the Sun, and the ejected plasma blobs should be plasmoids created in thesheet-like structure due to the tearing-mode instability. This observationreveals detailed magnetic field structure and dynamic process above the fluxcancellation sites and will help us to understand magnetic reconnection in thelower atmosphere of the Sun.

Observational Evidence of Magnetic Reconnection Associated with Magnetic Flux Cancellation