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A Nonlinear Force-Free Magnetic Field Approximation Suitable for Fast Forward-Fitting to Coronal Loops. I. Theory
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Markus J. Aschwanden Submitted: 2012-07-11 14:03
We derive an analytical approximation of nonlinear force-free
magnetic field solutions (NLFFF) that can efficiently be used
for fast forward-fitting to solar magnetic data, constrained either
by observed line-of-sight magnetograms and stereoscopically
triangulated coronal loops, or by 3D vector-magnetograph data.
The derived NLFFF solutions provide the magnetic field components
B_x({f x}), B_y({f x}), B_z({f x}), the force-free
parameter α {f x})$, the electric current density
{f j}({f x}), and are accurate to second-order (of the
nonlinear force-free α -parameter).
The explicit expressions of a force-free field can easily be applied
to modeling or forward-fitting of many coronal phenomena.
Authors: Markus J. Aschwanden
Projects: STEREO
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Publication Status: Solar Physics (in press)
Last Modified: 2012-07-12 09:38
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