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Table 2 Root mean square differences at the surface of the Earth (in nT) between the candidate models for different truncation degrees and different epochs. In the last row, only the SV is considered (in nT.yr −1)

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

Model 1 Model 2 Epoch Degree B X B Y B Z B
V-ASM Z-ASM 2014.3 25 1.39 1.81 1.90 1.48
V-ASM Z-ASM 2014.3 13 0.72 0.68 1.13 0.94
V-ASM Z-ASM 2015.0 25 2.71 2.34 3.67 3.26
V-ASM Z-ASM 2015.0 13 2.46 1.62 3.36 3.04
IGRF-12 V-ASM 2015.0 13 6.40 5.50 9.22 9.30
IGRF-12 Z-ASM 2015.0 13 6.77 5.87 9.77 9.90
V-ASM Z-ASM 2015.0 8 (SV) 2.64 1.65 3.59 2.98