Fig. 4From: Sequential modelling of the Earth’s core magnetic fieldPower spectra are displayed for the core field and secular variation for harmonic degrees 1 to 18, for epoch 2019.5. Left: CE model. Right: HS model. The blue line is the power spectrum of the core field. The orange line is the power spectrum of the SV. The dotted lines represent the power spectra of the respective priors. The green and red crosses represent the power spectra of the core field and SV, respectively, for Chaos-6. The spectra of the lithospheric field, at SH degree greater than 14, is not displayedBack to article page