The state of nonlinear force-free magnetic field extrapolation

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Wheatland, M.S.^1 ; Gilchrist, S.A.^1

Sydney Institute for Astronomy, School of Physics, University of Sydney, NSW 2006, Australia^1

关键词: Active regions;    Boundary data;    Computational task;    Coronal magnetic fields;    Magnetic field extrapolations;    Model solution;    Nonlinear force;    Present status;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012037/pdf
DOI  :  10.1088/1742-6596/440/1/012037

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Magnetic field extrapolation is the construction of a model solution for the coronal magnetic field in active regions from magnetic boundary data originating close to the Sun's surface. The nonlinear force-free model (in which the electric current density is parallel to the magnetic field) is often adopted to describe the coronal field. The solution of the nonlinear force-free equations is a challenging computational task, and the application of codes to available boundary data has revealed a number of significant problems with nonlinear force-free extrapolation. This paper summarises the present status of coronal field extrapolation, and describes some recent developments.