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We studied flux emergence events of sub-granular scale in a solar activeregion. New Solar Telescope (NST) of Big Bear Solar Observatory made itpossible to clearly observe the photospheric signature of flux emergence withvery high spatial (0".11 at 7057{\AA}) and temporal (15 s) resolution. From TiOobservations with the pixel scale of 0".0375, we found several elongatedgranule-like features (GLFs) stretching from the penumbral filaments of asunspot at a relatively high speed of over 4 km s-1. After a slender archeddarkening appeared at a tip of a penumbral filament, a bright point (BP)developed and quickly moved away from the filament forming and stretching aGLF. The size of a GLF was approximately 0.5" wide and 3" long. The moving BPencountered nearby structures after several minutes of stretching, and awell-defined elongated shape of a GLF faded away. Magnetograms from SDO/HMI andNST/IRIM revealed that those GLFs are photospheric indicators of small-scaleflux emergence, and their disappearance is related to magnetic cancellation.From two well-observed events, we describe detailed development of thesub-structures of GLFs, and different cancellation processes that each of thetwo GLFs underwent.

Photospheric Signatures of Granular-scale Flux Emergence and Cancellation at the Penumbral Boundary