Four steps are used to produce an NLFFF model from Magnetograms and coronal images. First we take a global potential field from a Carrington map comprised of a low resolution global magnetogram and a high resolution magnetogram centered on the active region; then we align coronal and chromospheric images to the magnetograom and identify the location of the filament; then we build a set of NLFFF models using flux insertion & magneto-frictional relaxation; and finally, compare model field lines with observed field lines to select the best fit NLFFF model. required
Non-linear Force-free Field

6-12 Feb. 2007 N/A required
2 May 2007 10953 required
16-17 May 2008 N/A required
8 Apr. 2010 11060 required

Section Photo