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, 59-65
Constraining Three-Dimensional Magnetic Field Extrapolations Using the Twin Perspectives of STEREO.pdf (Published (publisher's copy) - Peer Reviewed) 1.420Mb
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.
Irish Research Council for Science and Engineering Technology (IRCSET)
Type of material:Journal Article
Series/Report no:The Astrophysical Journal
Availability:Full text available