Fig. 9From: Co-estimation of geomagnetic field and in-orbit fluxgate magnetometer calibration parametersLowes–Mauersberger power spectra at Earth’s surface at four different epochs for the main field (red), secular variation (green), and secular acceleration (blue). Model A is represented by solid lines, CHAOS-6-x9 by dashed lines, and the difference between the two by dotted linesBack to article page