On the Nature of Coronal Loops

Details On the Nature of Coronal Loops On the Nature of Coronal Loops

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.29b&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

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 will compare two different models of an active region, one for two basically isolated sunspots, and another one for two sunspots surrounded by magnetic field patches similar to the chromospheric network.
The current paradigm is that these loops follow magnetic field lines as pearls on a string, and thus the majority of present corona models describe structures following the field lines.
Our study challenges this paradigm by showing through a three-dimensional model that coronal structures in complex magnetic field geometries might appear loop-like while they are not aligned with the magnetic field.
Using a forward model approach, both models result in emission from the corona being concentrated in loop structures.
In the first case the loops seen in EUV and X-ray emission are following the magnetic field.
However, in the second case, where the magnetic field is far from a force-free state, the loops seen in X-ray emission do not follow the magnetic field, but are more related to the current sheets formed in response to the footpoint motions of the magnetic field.
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 or in the complex magnetic structures within chromospheric network patches.

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