(Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, 79104 Freiburg, Germany)
Observation of a short-lived pattern in the solar chromosphere
Aims: In this work we investigate the dynamic behavior of inter-network
regions of the solar chromosphere.
Methods: We observed the chromosphere of the quiet Sun using a narrow-band
Lyot filter centered at the Ca II K2v emission peak with a bandpass of 0.3 A.
We achieved a spatial
resolution of on average 0.7" at a cadence of 10s.
Results: 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.
Conclusion: 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.
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