  In this work we investigate the dynamic behavior of inter-network regions of
the solar chromosphere. We observed the chromosphere of the quiet Sun using a
narrow-band Lyot filter centered at the Ca II K 2v emission peak with a
bandpass of 0.3A. We achieved a spatial resolution of on average 0.7" at a
cadence of 10s. In the inter-network we find a mesh-like pattern that features
bright grains at the vertices. The pattern has a typical spatial scale of 1.95"
and a mean evolution time scale of 53s with a standard deviation of 10s. A
comparison of our results with a recent three-dimensional radiation
hydrodynamical model implies that the observed pattern is of chromospheric
origin. The measured time scales are not compatible with those of reversed
granulation in the photosphere although the appearance is similar. A direct
comparison between network and inter-network structure shows that their typical
time scales differ by at least a factor of two. The existence of a rapidly
evolving small-scale pattern in the inter-network regions supports the picture
of the lower chromosphere as a highly dynamical and intermittent phenomenon.
