High resolution 2D-spectroscopy of granular dynamics

Spectroscopic data with high spatial resolution are used to study the granu lar dynamics of the Sun. The observations were obtained with the "Gottingen " two-dimensional (2D) Fabry-Perot interferometer in the Vacuum Tower Teles cope at the Observatorio del Teide/Tenerife. Time sequences of spectral sca ns across the nonmagnetic Fe I 5576 Angstrom line were taken from disc cent er. The 2D spectroscopic images were reconstructed with speckle methods, fr om which a spatial resolution of 0 " .4-0 " .5 was achieved. A Flower and c oherence analysis of intensity and velocity maps from different photospheri c heights has been carried out. The coherence between intensity and velocit y fluctuations stays high for structural scales >0 " .5, which underlines t he high spatial resolution of the data. Furthermore, the vertical flow fiel d and it; time evolution within exploding granules have been analyzed. We f ind fast downflows in the dark centers of exploding granules with velocitie s up to 1.2 km s(-1). Additionally, we estimated the flow velocities of so- called "dark dots". We discuss indications that these structures represent a new type of downflow within the centers of bright granules.