NONLINEAR FORCE-FREE FIELD MODELING OF A SOLAR ACTIVE REGION AROUND THE TIME OF A MAJOR FLARE AND CORONAL MASS EJECTION

摘要: Solar flares and coronal mass ejections are associated with rapid changes in field connectivity powered by the partial dissipation of electrical currents solar atmosphere. A critical unanswered question is whether involved induced motion preexisting atmospheric magnetic flux subject to surface plasma flows or these emergence from within convective zone. We address this problem applying state-of-the-art nonlinear force-free (NLFFF) modeling highest resolution quality vector-magnetographic data observed recently launched Hinode satellite on NOAA AR 10930 around time a powerful X3.4 flare. compute 14 NLFFF models four different codes variety boundary conditions. find that model fields differ markedly geometry, energy content, force-freeness. discuss relative merits general critique present abilities based vector measurements. For our application particular, we fair agreement best-fit configuration, argue (1) strong emerge together preceding flare, (2) carried an ensemble thin strands, (3) global pattern lines compatible large-scale twisted rope topology, (4) ~1032 erg change suffices power flare its ejection.