Fig. 6.From: Earth magnetic field modeling from Oersted and Champ dataEvolution of Gauss coefficients computed from Champ data. Black—all local times, red—day local times (6:00 to 18:00 LT), blue—night local times (18:00 to 6:00 LT). (a) g 01 , (b) g 22 Back to article page