Fig. 10From: Geomagnetic core field models and secular variation forecasts for the 13th International Geomagnetic Reference Field (IGRF-13)Evolution of the sAPE(t) of zonal secular variation coefficients based on Model 1 of the three forecasts experiments started in 1995 (top panel), in 2005 (middle panel) and in 2015 (bottom panel), respectivelyBack to article page