The Influence of Spatial Resolution on Nonlinear Force-Free Modeling

摘要: The nonlinear force-free field (NLFFF) model is often used to describe the solar coronal magnetic field, however a series of earlier studies revealed difficulties in numerical solution application photospheric boundary data. We investigate sensitivity modeling spatial resolution data, by applying multiple codes that numerically solve NLFFF sequence vector magnetogram data at different resolutions, prepared from single Hinode/SOT-SP scan NOAA Active Region 10978 on 2007 December 13. analyze resulting energies and relative helicities, employ Helmholtz decomposition characterize divergence errors, quantify changes made order be compatible with model. This study shows results depend quantitatively input using more highly resolved yields self-consistent results. free solutions generally trend higher increasing resolution, while helicity values vary significantly between resolutions for all methods. All methods require changing horizontal components, some also vertical excess nominal uncertainties produced various are each level. continue recommend verifying agreement modeled lines corresponding loop images before any scientific setting.