Fig. 8From: Verification of the geomagnetic field models using historical satellite measurements obtained in 1964 and 1970Comparison of the new models based on the Kosmos-49 (N-1, a) and Kosmos-321 (N-2, b) measurements with the IGRF model for 1964 and 1970, respectively. Each map shows differences in the Z component of the geomagnetic field at the nodes of the regular geographic grid at a spherical surface with the mean Earth radius, 6371.2 kmBack to article page