On the numerical computation of nonlinear force-free magnetic fields

Statistics – Computation

Scientific paper

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Force-Free Magnetic Fields, Magnetic Field Configurations, Magnetic Flux, Solar Magnetic Field, Photosphere, Potential Fields, Solar Atmosphere

Scientific paper

An algorithm has been developed to extrapolate nonlinear force-free magnetic fields from the photosphere, given the proper boundary conditions. This paper presents the results of this work, describing the mathematical formalism that was developed, the numerical techniques employed, and comments on the stability criteria and accuracy developed for these numerical schemes. An analytical solution is used for a benchmark test; the results show that the computational accuracy for the case of a nonlinear force-free magnetic field was on the order of a few percent (less than 5 percent). This newly developed scheme was applied to analyze a solar vector magnetogram, and the results were compared with the results deduced from the classical potential field method. The comparison shows that additional physical features of the vector magnetogram were revealed in the nonlinear force-free case.

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