Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-13
Astronomy and Astrophysics
Astrophysics
8 pages, 9 figures
Scientific paper
10.1051/0004-6361:20054115
We investigate the morphological, dynamical, and evolutionary properties of the internetwork and network fine structure of the quiet sun at disk centre. The analysis is based on a $\sim$6 h time sequence of narrow-band filtergrams centred on the inner-wing \Ca II K$_{\rm 2v}$ reversal at 393.3 nm. The results for the internetwork are related to predictions derived from numerical simulations of the quiet sun. The average evolutionary time scale of the internetwork in our observations is 52 sec. Internetwork grains show a tendency to appear on a mesh-like pattern with a mean cell size of $\sim$4-5 arcsec. Based on this size and the spatial organisation of the mesh we speculate that this pattern is related to the existence of photospheric downdrafts as predicted by convection simulations. The image segmentation shows that typical sizes of both network and internetwork grains are in the order of 1.6 arcs.
Schmidt Wolfgang
Tritschler Alexandra
Uitenbroek Han
Wedemeyer-Boehm Sven
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