IBIS: Reversed granulation in the quiet photosphere

The phenomenon of "reversed granulation", i.e. the partial reversal of the intensity pattern occurring in the low photosphere, is predicted by numerical simulations and mostly observed in the extended wings of chromespheric lines. In this contribution we present high spatial resolution 2D maps of the reversed granulation, obtained from line core images of the photospheric Fe I 7090.4 angstrom line, as well as the temporal evolution of their correlation with continuum maps, that suggests the presence of gravity waves in the mid-photosphere.