caa a22 4500 445346191 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s11207-011-9782-x doi (NATIONALLICENCE)springer-10.1007/s11207-011-9782-x A New Method for Modeling the Coronal Magnetic Field with STEREO and Submerged Dipoles [Elektronische Daten] [A. Sandman, M. Aschwanden] Recent magnetic modeling efforts have shown substantial misalignment between theoretical models and observed coronal loop morphology as observed by STEREO/EUVI, regardless of the type of model used. Both potential field and non-linear force-free field (NLFFF) models yielded overall misalignment angles of 20 - 40 degrees, depending on the complexity of the active region (Sandman et al., Solar Phys. 259, 1, 2009; DeRosa et al., Astrophys. J. 696, 1780, 2009) We demonstrate that with new, alternative forward-fitting techniques, we can achieve a significant reduction in the misalignment angles compared with potential field source surface (PFSS) models and NLFFF models. Fitting a series of submerged dipoles to the field directions of stereoscopically triangulated loops in four active regions (30 April, 9May, 19May, and 11 December 2007), we find that 3 - 5 dipoles per active region yield misalignment angles of ∼ 11° - 18°, afactor of two smaller than those given by previously established extrapolation methods. We investigate the spatial and temporal variation of misalignment angles with subsets of loops for each active region, as well as loops observed prior to and following a flare and filament eruption, and find that the spatial variation of median misalignment angles within an active region (up to 75%) exceeds the temporal variation associated with the flare (up to 40%). We also examine estimates of the stereoscopic error of our analysis. The corrected values yield a residual misalignment of 7° - 13°, which is attributed to the non-potentiality due to currents in the active regions. Springer Science+Business Media B.V., 2011 Active regions nationallicence Magnetic fields nationallicence Corona nationallicence Magnetic fields nationallicence Models nationallicence Sandman A. Rice University, 6100 Main St., TX 77005, Houston, USA aut Aschwanden M. Rice University, 6100 Main St., TX 77005, Houston, USA aut Solar Physics Springer Netherlands 270/2(2011-06-01), 503-522 0038-0938 270:2<503 2011 270 11207 https://doi.org/10.1007/s11207-011-9782-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9782-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sandman A. Rice University, 6100 Main St., TX 77005, Houston, USA aut NATIONALLICENCE 700 1- Aschwanden M. Rice University, 6100 Main St., TX 77005, Houston, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/2(2011-06-01), 503-522 0038-0938 270:2<503 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer