  We observed small scale magnetic flux emergence in a sunspot moat region by
the Solar Optical Telescope (SOT) aboard the Hinode satellite. We analyzed
filtergram images observed in the wavelengths of Fe 6302 angstrom, G-band and
Ca II H. In Stokes I images of Fe 6302 angstrom, emerging magnetic flux were
recognized as dark lanes. In G-band, they showed their shapes almost the same
as in Stokes I images. These magnetic flux appeared as dark filaments in Ca II
H images. Stokes V images of Fe 6302 angstrom showed pairs of opposite
polarities at footpoints of each filament. These magnetic concentrations are
identified to correspond to bright points in G-band/Ca II H images. From the
analysis of time-sliced diagrams, we derived following properties of emerging
flux, which are consistent with the previous works. (1) Two footpoints separate
each other at a speed of 4.2 km/s during the initial phase of evolution and
decreases to about 1 km/s in 10 minutes later. (2) Ca II H filaments appear
almost simultaneously with the formation of dark lanes in Stokes I in the
observational cadence of 2 minutes. (3) The lifetime of the dark lanes in
Stokes I and G-band is 8 minutes, while that of Ca filament is 12 minutes. An
interesting phenomena was observed that an emerging flux tube expands laterally
in the photosphere with a speed of 3.8 km/s. Discussion on the horizontal
expansion of flux tube will be given with refernce to previous simulation
studies.
