Fig. 7From: DTU candidate field models for IGRF-12 and the CHAOS-5 geomagnetic field modelTime dependence of the next 27 spherical harmonic coefficients (\(dg^{2}_5/dt\) to \(dg^{3}_7/dt\)) of the secular variation from CHAOS-5l (solid red line) with CHAOS-4l (green dashed line) also shown for reference. The blue circle denotes the DTU SV-2015-2020 candidate model in 2015.0Back to article page