Fig. 3.From: The CHAOS-3 geomagnetic field model and candidates for the 11th generation IGRFFirst time derivatives, , of the internal Gauss coefficients, in nT/yr. Symbols represent annual differences of time series of Gauss coefficients obtained from CHAMP “virtual observatories” monthly means, while the curves show model values obtained from CHAOS-2s (red), “extended CHAOS-2s” (magenta), CHAOS-3α (green) and CHAOS-3 (blue) models.Back to article page