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Bootstrapping the coronal magnetic field with STEREO: I. Unipolar Potential Field Modeling View all abstracts by submitter

Markus J. Aschwanden   Submitted: 2010-04-27 16:25

We investigate the recently quantified misalignment of α mis approx 20°-40° between the 3-D geometry of stereoscopically triangulated coronal loops observed with STEREO/EUVI (in four active regions) and theoretical (potential or nonlinear force-free) magnetic field models extrapolated from photospheric magnetograms. We develop an efficient method of bootstrapping the coronal magnetic field by forward-fitting a parameterized potential field model to the STEREO-observed loops. The potential field model consists of a number of unipolar magnetic charges that are parameterized by decomposing a photospheric magnetogram from MDI. The forward-fitting method yields a best-fit magnetic field model with a reduced misalignment of α PF approx 13°-20°. We evaluate also stereoscopic measurement errors and find a contribution of α SEapprox 7°-12°, which constrains the residual misalignment to α NP α PF α SEapprox 5° -9°, which is likely due to the nonpotentiality of the active regions. The residual misalignment angle α NP of the potential field due to nonpotentiality is found to correlate with the soft X-ray flux of the active region, which implies a relationship between electric currents and plasma heating.

Authors: Markus J. Aschwanden and Anne W. Sandman

Publication Status: Astronomical Journal 140, 723-734, (2010, Sept issue)
Last Modified: 2010-08-06 12:38
Go to main E-Print page  Automated Coronal Loop Detection based on Contour Extraction and Contour Classification from the SOHO/EIT Images  G-band and Hard X-ray Emissions of the 2006 December 14 flare observed by Hinode/SOT and RHESSI  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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