Nonlinear Force-Free Magnetic Field Modeling of AR 10953: A Critical Assessment

Details Nonlinear Force-Free Magnetic Field Modeling of AR 10953: A Critical Assessment Nonlinear Force-Free Magnetic Field Modeling of AR 10953: A Critical Assessment

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.3102d&link_type=abstract

American Astronomical Society, SPD meeting #40, #31.02; Bulletin of the American Astronomical Society, Vol. 41, p.865

Astronomy and Astrophysics

Astronomy

Scientific paper

Nonlinear force-free field (NLFFF) modeling seeks to provide accurate representations of the structure of the magnetic field above solar active regions, from which estimates of physical quantities of interest (e.g., free energy and helicity) can be made. However, the suite of NLFFF algorithms have failed to arrive at consistent solutions when applied to (thus far, two) cases using the highest-available-resolution vector magnetogram data from Hinode/SOT-SP (in the region of the modeling area of interest) and line-of-sight magnetograms from SOHO/MDI (where vector data were not available). One issue is that NLFFF models require consistent, force-free vector magnetic boundary data, and vector magnetogram data sampling the photosphere do not satisfy this requirement. Consequently, several problems have arisen that are believed to affect such modeling efforts. We use AR 10953 to illustrate these problems, namely: (1) some of the far-reaching, current-carrying connections are exterior to the observational field of view, (2) the solution algorithms do not (yet) incorporate the measurement uncertainties in the vector magnetogram data, and/or (3) a better way is needed to account for the Lorentz forces within the layer between the photosphere and coronal base. In light of these issues, we conclude that it remains difficult to derive useful and significant estimates of physical quantities from NLFFF models.

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