Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO
Citation:
Conlon, Paul A. and Gallagher, P.T., Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO, The Astrophysical Journal, 715, 1, 2010, 59-65Download Item:
Abstract:
The three-dimensional magnetic topology of a solar active region (NOAA 10956) was reconstructed using a linear force-free field extrapolation constrained using the twin perspectives of STEREO. A set of coronal field configurations was initially generated from extrapolations of the photospheric magnetic field observed by the Michelson Doppler Imager on SOHO. Using an EUV intensity-based cost function, the extrapolated field lines that were most consistent with 171 ? passband images from the Extreme UltraViolet Imager on STEREO were identified. This facilitated quantitative constraints to be placed on the twist (?) of the extrapolated field lines, where ? ? B = ?B. Using the constrained values of ?, the evolution in time of twist, connectivity, and magnetic energy were then studied. A flux emergence event was found to result in significant changes in the magnetic topology and total magnetic energy of the region.
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Irish Research Council for Science and Engineering Technology (IRCSET)
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http://people.tcd.ie/gallagptDescription:
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Author: GALLAGHER, PETER; CONLON, PAUL ANTHONY
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The Astrophysical Journal715
1
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