A Magnetostatic Grad-Rubin Code for Coronal Magnetic Field Extrapolations

作者：Gilchrist S A^*; Wheatland M S

来源：Solar Physics, 2013, 282(1): 283-302.

DOI：10.1007/s11207-012-0144-0

• Corona
• Extrapolations
• Force-free
• Grad-Rubin
• Magnetic fields
• Magnetostatic
• Models

The coronal magnetic field cannot be directly observed, but, in principle, it can be reconstructed from the comparatively well observed photospheric magnetic field. A popular approach uses a nonlinear force-free model. Non-magnetic forces at the photosphere are significant, meaning the photospheric data are inconsistent with the force-free model, and this causes problems with the modeling (De Rosa et al., Astrophys. J. 696, 1780, 2009). In this paper we present a numerical implementation of the Grad-Rubin method for reconstructing the coronal magnetic field using a magnetostatic model. This model includes a pressure force and a non-zero magnetic Lorentz force. We demonstrate our implementation on a simple analytic test case and obtain the speed and numerical error scaling as a function of the grid size.

• 出版日期2013-1