Fig. 4.
From: Modelling the Earth’s core magnetic field under flow constraints
Left: Evolution of the power spectra of the static part of the core magnetic field (CF), its SV and its acceleration (SA) for different values of the damping parameter: λ3 = 10d. The estimated power spectrum of the background acceleration (BSA) is shown by the solid line. The power spectra are calculated for year 2005.4 at the Earth’s reference radius. Right: Trade-off curve between the SA energy and a measure of the misfit to the data. The labels on the points give the corresponding values of the damping parameter: λ3 = 10d.