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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: COV-OBS.x2: 180 years of geomagnetic field evolution from ground-based and satellite observations

Fig. 2

PSD associated with the stochastic processes that define the a priori information used for the construction of COV-OBS.x2 for the axial dipole (blue) and the equatorial dipole (orange) coefficients. Comparison with the corresponding PSD for the axial dipole in COV-ARCH ( Hellio and Gillet 2018, dashed black), and for all dipole coefficients in previous COV-OBS models (Gillet et al. 2013, 2015, dashed green)

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