Fig. 6.From: On the possibility of extending the IGRF predictive secular variation model to a higher SH degreePower spectra of the POMME5-post05 2009 secular variation model (solid thick line) and of the differences between this model and the IGRF-10 predictive secular variation model (up to degree 8, solid thin line) or the EIGRF predictive secular variation model (up to degree 13, dashes). All spectra are computed at Earth’s surface.Back to article page