On the nature of coronal loops above the quiet sun network

• Published in: Advances in space research Vol. 45; no. 2; pp. 310 - 313
• Main Authors: Bingert, S., Zacharias, P., Peter, H., Gudiksen, B.V.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 15-01-2010; Elsevier
• Subjects: Astronomy; Corona; Coronal loops; Earth, ocean, space; Exact sciences and technology; External geophysics; Iloops; MHD; Sun; MHD; Iloops; Corona; Coronal loops; Sun; Magnetic flux; Field line; Far field; Quiet sun; Space research; Corona model; Three dimensional model; MHD model; Coronal loop; Dynamics; Magnetic line; Magnetic fields; Sunspots; X ray emission; Stellar coronae
• ISSN: 0273-1177; 1879-1948
• DOI: 10.1016/j.asr.2009.08.020

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.