2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/4886Recently Gizon, Duvall and Schou (2002) suggested that supergranulation has a wave-like component. In this paper I show that the same phenomenon can be observed using surface Doppler shift data, thereby confirming their observations. I am also able to measure the dispersion relation to lower wavenumbers and to extend the results for rotation and meridional flows beyond +/-70 degrees latitude.10 pages, 6 figuresAstrophysicstext