Overshoot of horizontal and vertical velocities in the deep solar photosphere

The authors present the results of a coherence analysis of the centre-to-limb behaviour of the small-scale intensity and velocity fluctuations. The vertical velocity is coherent throughout the low-middle photosphere and is correlated with the continuum intensity variations. The horizontal velocity variations are not coherent with the intensity variations, and with the vertical velocity variations. The horizontal velocity is coherent only in the low atmosphere. Thus the horizontal motion is independent from the vertical motion and is not of convective nature.