Bremen 2017 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 4: Sonne und Heliosphäre I
EP 4.3: Talk
Tuesday, March 14, 2017, 14:45–15:00, GW2 B2880
Nonlinear force-free coronal magnetic stereoscopy — •Iulia Chifu1,2, Thomas Wiegelmann1, and Bernd Inhester1 — 1MPI für Sonnensystemforschung, Justus-von-Liebig-weg 3, 37077, Goettingen,Germany — 2Astronomical Institute of Romanian Academy, Cutitul de Argint 5, Bucharest, Romania
Getting insights into the 3D structure of the solar coronal magnetic field have been done in the past by two completely different approaches: (1.) Nonlinear force-free field (NLFFF) extrapolations, which use photospheric vector magnetograms as boundary condition. (2.) Stereoscopy of coronal magnetic loops observed in EUV coronal images from different vantage points. Both approaches have their strength and weaknesses. Within this work we present an extension of a NLFFF method which includes the 3D stereoscopic reconstructions of the coronal loops. We apply the newly developed code to a combined data-set from SDO/HMI, SDO/AIA and the two STEREO spacecraft. We find that prescribing the 3D stereoscopically reconstructed coronal loops the S-NLFFF method leads to an agreement between the modelled field and the stereoscopically reconstructed one. It leads also to a decrease in the angle between the current and the magnetic field which indicates an improvement in the force-free solution by a factor of two.