Computing nonlinear force-free fields in spherical geometry
| dc.creator | Wiegelmann, Thomas | |
| dc.date | 2006-12-05 | |
| dc.date.accessioned | 2026-07-07T11:42:41Z | |
| dc.date.available | 2026-07-07T11:42:41Z | |
| dc.description | We describe a newly developed code for the extrapolation of nonlinear force-free coronal magnetic fields in spherical coordinates. The program uses measured vector magnetograms on the solar photosphere as input and solves the force-free equations in the solar corona. The method is based on an optimization principle and the heritage of the newly developed code is a corresponding method in Cartesian geometry. We test the newly developed code with the help of a semi-analytic solution and rate the quality of our reconstruction qualitatively by magnetic field line plots and quantitatively with a number of comparison metrics. We find that we can reconstruct the original test field with high accuracy. The method is fast if the computation is limited to low co-latitudes (say $30^\circ \leq θ\leq 150^\circ$), but becomes significantly slower if the polar regions are included. | |
| dc.description | 16 pages, 3 figures, Solar Physics, accepted | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0612124 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0612124 | |
| dc.identifier | SolarPhys.240:227-239,2007 | |
| dc.identifier | doi:10.1007/s11207-006-0266-3 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/200968 | |
| dc.subject | Astrophysics | |
| dc.subject | Computational Physics | |
| dc.title | Computing nonlinear force-free fields in spherical geometry | |
| dc.type | text |