A self-consistent nonlinear force-free solution for a solar solution for a solar active region magnetic field

Wheatland, Michael and Regnier, Stephane (2009) A self-consistent nonlinear force-free solution for a solar solution for a solar active region magnetic field. The Astrophysical Journal, 700 (2). L88-L91. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1088/0004-637X/700/2/L88

Abstract

Nonlinear force-free solutions for the magnetic field in the solar corona constructed using photospheric vector magnetic field boundary data suffer from a basic problem: the observed boundary data are inconsistent with the nonlinear force-free model. Specifically, there are two possible choices of boundary conditions on vertical current provided by the data, and the two choices lead to different force-free solutions. A novel solution to this problem is described. Bayesian probability is used to modify the boundary values on current density, using field-line connectivity information from the two force-free solutions and taking into account uncertainties, so that the boundary data are more consistent with the two nonlinear force-free solutions. This procedure may be iterated until a set of self-consistent boundary data (the solutions for the two choices of boundary conditions are the same) is achieved. The approach is demonstrated to work in application to Hinode/Solar Optical Telescope observations of NOAA active region 10953.

Item Type: Article
Uncontrolled Keywords: Sun: corona; Sun: magnetic fields
Subjects: F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Stephane Regnier
Date Deposited: 08 Jun 2015 08:23
Last Modified: 17 May 2017 05:18
URI: http://nrl.northumbria.ac.uk/id/eprint/21301

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