Nonlinear Force-Free Extrapolation of Vector Magnetograms into the Corona

Details Nonlinear Force-Free Extrapolation of Vector Magnetograms into the Corona Nonlinear Force-Free Extrapolation of Vector Magnetograms into the Corona

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh33c..05t&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH33C-05

Astronomy and Astrophysics

Astrophysics

[7509] Solar Physics, Astrophysics, And Astronomy / Corona, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

To investigate the structure and evolution of the coronal magnetic field, we extrapolate measurements of the photospheric magnetic field vector into the corona based on the force-free assumption. A complication of this approach is that the measured photospheric magnetic field is not force-free and that one has to apply a preprocessing routine in order to achieve boundary conditions suitable for the force-free modelling. Furthermore the nonlinear force-free extrapolation code takes errors in the photospheric field data into account which occur due to noise, incomplete inversions or ambiguity removing techniques. Within this work we compare extrapolations from SDO/HMI and SOLIS vector magnetograms and explain how to find optimum parameters for handling the data of a particular instrument. The resulting coronal magnetic field lines are quantitatively compared with coronal EUV-images from SDO/AIA.

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