Fig. 6From: Verification of the geomagnetic field models using historical satellite measurements obtained in 1964 and 1970Comparison of the 1964–1970 SV of the Z component based on the M-1 and M-2 models with the 1965–1970 SV derived from the IGRF model. The map shows the differences of the SV (Z) calculated at the nodes of the regular geographic grid at a spherical surface with the mean Earth radius, 6371.2 kmBack to article page