Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...641.1188b&link_type=abstract
The Astrophysical Journal, Volume 641, Issue 2, pp. 1188-1196.
Astronomy and Astrophysics
Astronomy
2
Magnetic Fields, Methods: Numerical, Sun: Corona
Scientific paper
We outline a method for quantifying the performance of extrapolation methods for magnetic fields. We extrapolate the field for two model cases, using a linear force-free approach and a nonlinear approach. Each case contains a different topological feature of the field that may be of interest in solar energetic events. We are able to determine quantitatively whether either method is capable of reproducing the topology of the field. In one of our examples, a subjective evaluation of the performance of the extrapolation suggests that it has performed quite well, while our quantitative score shows that this is not the case, indicating the importance of being able to quantify the performance. Our method may be useful in determining which extrapolation techniques are best able to reproduce a force-free field and which topological features can be recovered.
Barnes Graham
Leka Kimberly Dawn
Wheatland Michael S.
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