Comparing magnetic field extrapolations with measurements of magnetic loops

Details Comparing magnetic field extrapolations with measurements of magnetic loops Comparing magnetic field extrapolations with measurements of magnetic loops

2008-01-29

arxiv.org/abs/0801.4519v1

Astron.Astrophys.433:701-705,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures

Scientific paper

10.1051/0004-6361:20042421

We compare magnetic field extrapolations from a photospheric magnetogram with the observationally inferred structure of magnetic loops in a newly developed active region. This is the first time that the reconstructed 3D-topology of the magnetic field is available to test the extrapolations. We compare the observations with potential fields, linear force-free fields and non-linear force-free fields. This comparison reveals that a potential field extrapolation is not suitable for a reconstruction of the magnetic field in this young, developing active region. The inclusion of field-line-parallel electric currents, the so called force-free approach, gives much better results. Furthermore, a non-linear force-free computation reproduces the observations better than the linear force-free approximation, although no free parameters are available in the former case.

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