Observation of a short-lived pattern in the solar chromosphere

F. Wöger; S. Wedemeyer-Böhm; W. Schmidt; O. von der Lühe

doi:doi:10.1051/0004-6361:20066237

Free access

Issue		A&A Volume 459, Number 1, November III 2006


Page(s)		L9 - L12
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20066237

A&A 459, L9-L12 (2006)
DOI: 10.1051/0004-6361:20066237

Letter

Observation of a short-lived pattern in the solar chromosphere

F. Wöger, S. Wedemeyer-Böhm, W. Schmidt and O. von der Lühe

Kiepenheuer-Institut für Sonnenphysik, Schöneckstraße 6, 79104 Freiburg, Germany
e-mail: [woeger,wedemeyer,wolfgang,ovdluhe]@kis.uni-freiburg.de

(Received 11 August 2006 / Accepted 13 September 2006 )

Abstract
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 $\ion{Ca}{ii}$ K $_{\rm 2v}$ emission peak with a bandpass of 0.3 Å. We achieved a spatial resolution of on average 0 $\farcs$ 7 at a cadence of 10 s.
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 $\farcs$ 95 and a mean evolution time scale of 53 s with a standard deviation of 10 s. 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.
Conclusions.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.

Key words: Sun: chromosphere

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