Fig. 9From: Verification of the geomagnetic field models using historical satellite measurements obtained in 1964 and 1970Comparison of the SV (Z) derived from the N-1 and N-2 models over 1964–1970 with the SV (Z) according to the IGRF model over 1965–1970. The map shows the SV (Z) differences calculated at the nodes of the regular geographic grid between 60oN and 60oS at a spherical surface with the mean Earth radius, 6371.2 kmBack to article page