  We studied 101 flux emergence events ranging from small ephemeral regions to
large emerging flux regions which were observed with Hinode Solar Optical
Telescope filtergram. We investigated how the total magnetic flux of the
emergence event controls the nature of emergence. To determine the modes of
emergences, horizontal velocity fields of global motion of the magnetic patches
in the flux emerging sites were measured by the local correlation tracking.
Between two main polarities of the large emerging flux regions with more than
around 2 \times 10^19 Mx, there were the converging flows of anti-polarity
magnetic patches. On the other hand, small ephemeral regions showed no
converging flow but simple diverging pattern. When we looked into the detailed
features in the emerging sites, irrespective of the total flux and the spatial
size, all the emergence events were observed to consist of single or multiple
elementary emergence unit(s). The typical size of unitary emergence is 4 Mm and
consistent with the simulation results. From the statistical study of the flux
emergence events, the maximum spatial distance between two main polarities, the
magnetic flux growth rate and the mean separation speed were found to follow
the power-law functions of the total magnetic flux with the indices of 0.27,
0.57, and -0.16, respectively. From the discussion on the observed power-law
relations, we got a physical view of solar flux emergence that emerging
magnetic fields float and evolve balancing to the surrounding turbulent
atmosphere. Key words: Sun: magnetic fields - Sun: emerging flux - Sun:
photosphere - Sun: chromosphere
