The gradient of vertical velocities and acoustic events in the solar photosphere: a comparison between the MHD simulation and Hinode observations

We present a scientific dataset allowing to investigate the gradient of vertical velocities and acoustic events of the solar photosphere. For that purpose, we used results of a MHD numerical simulation and a sequence of observations (spectroscopic scans) from Hinode (JAXA/NASA) at disk centre. The simulation and observations appear to be in good agreement; they exhibit upward and downward gradients respectively in intergranules and granules, together with sporadic acoustic events (upward propagating waves) mainly in intergranular lanes. Such events are derived from the computation of amplitudes and phase lags of waves between two altitudes, providing the phase, group velocities and the energy flux, under some assumptions.