Fig. 3From: Main field and secular variation candidate models for the 12th IGRF generation after 10 months of Swarm measurementsDifference at Earth’s mean radius between V-ASM and Z-ASM models at epoch 2014.3 and for the full expansion. From top left to bottom right, B X , B Y , B Z , and B, respectively. Thin lines indicate magnetic equator and 50° magnetic quasi-dipole latitudesBack to article page