Fig. 10From: Verification of the geomagnetic field models using historical satellite measurements obtained in 1964 and 1970Power spectra of models IGRF, M-1,2 and N-1,2 and the differences between IGRF and M-1,2, IGRF and N-1,2 at epochs 1964.826 (October 29, 1964) (a) and 1970.144 (February 22, 1970) (b), respectively, at Earth mean radius (6371.2 km)Back to article page