Evolution of velocity granulation fields (based on THEMIS-IPM observations)

The overshooting into the stable photosphere of convective flows, coming from the deeper layers of the solar structure, produces a granulation pattern. that evolves on short time scales and that is well correlated in intensity and velocity. In this work we present the first results of the analysis of observations obtained at the THEMIS telescope with the IPM (Italian Panoramic Monochromator). In particular we investigate the time lag of velocity spatial pattern at different heights and how this lag evolves with time.