Computer Science – Performance
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2902m&link_type=abstract
American Astronomical Society, SPD meeting #40, #29.02; Bulletin of the American Astronomical Society, Vol. 41, p.863
Computer Science
Performance
Scientific paper
Non-linear force-free fields are the most general case of force-free fields, but the hardest to model as well. There are numerous methods of computing such fields by extrapolating vector magnetograms from the photosphere, but very few attempts have so far made quantitative use of coronal morphology. We present an improved method which infers properties of the force-free field from X-Ray and EUV images of active region coronal loops. Each loop evident in an image is fit to field lines from constant-alpha fields. Our algorithm thereby estimates the three-dimensional geometry of each loop as well its local twist (alpha) and the magnetic field strength over its length. We assess the performance of this method by applying it to known examples of 3D non-linear force free fields. We demonstrate that at least some features of the local twist distribution could be reconstructed using this method.
Longcope Dana Warfield
Malanushenko Anna
McKenzie David E.
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