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Fig. 8 | Earth, Planets and Space

Fig. 8

From: Main field and secular variation candidate models for the 12th IGRF generation after 10 months of Swarm measurements

Fig. 8

Magnetic energy spectra of V-ASM, Z-ASM, and adopted IGRF models, for the main field (left panel) and the secular variation (right panel). Also shown are the spectra of the differences between models. For the SV, models are shown up to degree 13, although terms for n>8 are not considered for IGRF. Note that on the left panel, red, black, and blue curves are superimposed

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