Fig. 1From: Geomagnetic secular variation forecast using the NASA GEMS ensemble Kalman filter: A candidate SV model for IGRF-13SV validation forecasts (dashed line) and CM6 values (solid line) for 2010-2015 for scaled Gauss coefficients \(l=1, m=1\) (a) and \(l=2, m=2\) (b) (\(G_l^m\), \(H_l^m\)) normalized using \(g_1^0\) from 2009. The resulting SV values are shown in Table 2Back to article page