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How to optimize nonlinear force-free coronal magnetic field extrapolations from SDO/HMI vector magnetograms? View all abstracts by submitter

Thomas Wiegelmann   Submitted: 2012-02-17 01:02

The SDO/HMI instruments provide photospheric vector magnetograms with a highspatial and temporal resolution. Our intention is to model the coronal magneticfield above active regions with the help of a nonlinear force-freeextrapolation code. Our code is based on an optimization principle and has beentested extensively with semi-analytic and numeric equilibria and been appliedbefore to vector magnetograms from Hinode and ground based observations.Recently we implemented a new version which takes measurement errors inphotospheric vector magnetograms into account. Photospheric field measurementsare often due to measurement errors and finite nonmagnetic forces inconsistentas a boundary for a force-free field in the corona. In order to deal with theseuncertainties, we developed two improvements: 1.) Preprocessing of the surfacemeasurements in order to make them compatible with a force-free field 2.) Thenew code keeps a balance between the force-free constraint and deviation fromthe photospheric field measurements. Both methods contain free parameters,which have to be optimized for use with data from SDO/HMI. Within this work wedescribe the corresponding analysis method and evaluate the force-freeequilibria by means of how well force-freeness and solenoidal conditions arefulfilled, the angle between magnetic field and electric current and bycomparing projections of magnetic field lines with coronal images from SDO/AIA.We also compute the available free magnetic energy and discuss the potentialinfluence of control parameters.

Authors: T. Wiegelmann, J.K. Thalmann, B. Inhester, T. Tadesse, X. Sun, J.T. Hoeksema
Projects: SDO-HMI

Publication Status: Sol. Phys., accepted
Last Modified: 2012-02-17 08:42
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