Scaling behavior of the vertical velocity field in the solar photosphere

We analyze, for the first time, the scaling behavior of the photospheric ve rtical velocity field. Our analysis is based on data collected by the Itali an Panoramic Monocromator (IPM) mounted at the THEMIS telescope at the Span ish "Observatorio del Teide" (Tenerife) of the Institute de Astrofisica de Canarias. We investigate the occurrence of scaling in the cancellations bet ween downflow and upflow of the vertical velocity field, showing that the f ield possesses well pronunced sign-singularity in the range of scales from more than 10 Mm down to the granulation scale.