Fig. 1From: The Kalmag model as a candidate for IGRF-13Stationary state energy spectra at the Earth’s surface of the different magnetic sources given in Table 1. Black and red circles are the energy spectra of, respectively, the CHAOS-6.9 core field model of Finlay et al. (2016) in 2015.0 and the LCS-1 lithospheric field model of Olsen et al. (2017)Back to article page