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On the nature of coronal loops above the quiet sun network
Authors:S Bingert  P Zacharias  H Peter  BV Gudiksen
Institution:1. Kiepenheuer Institut für Sonnenphysik, Schöneckstrasse 6, 70194 Freiburg, Germany;2. Institute of Theoretical Astrophysics, University of Oslo, 0315 Oslo, Norway
Abstract:The structure and dynamics of a box in a stellar corona can be modeled employing a 3D MHD model for different levels of magnetic activity. Depending on the magnetic flux through the surface the nature of the resulting coronal structures can be quite different. We investigate a model of an active region for two sunspots surrounded by magnetic field patches comparable in magnetic flux to the sunspots. The model results in emission from the model corona being concentrated in loop structures. In Gudiksen and Nordlund (2005) the loops seen in EUV and X-ray emission outline the magnetic field, following the general paradigm. However, in our model, where the magnetic field is far from a force-free state, the loops seen in X-ray emission do not follow the magnetic field lines. This result is of interest especially for loops as found in areas where the magnetic field emerging from active regions interacts with the surrounding network.
Keywords:MHD  Sun  Corona  Coronal loops  Iloops
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