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Table 6 Root-mean-square differences in nT/year between observatory-derived secular variation splines and IGRF-12 candidates over the 2015–2020 time period

From: Evaluation of candidate models for the 13th generation International Geomagnetic Reference Field

2015–2020 B-12 CU-12 D-12 G-12 IP-12 IS-12 IZ-12 LN-12 N-12 M \(M_{\text{med}}\) IGRF-12
\({\text{d}}B_x/{\text{d}}t\) 11.76 12.10 11.64 11.53 11.20 11.68 12.41 11.65 12.81 11.47 11.31 11.47
\({\text{d}}B_y/{\text{d}}t\) 9.35 11.22 11.24 10.92 10.64 12.99 12.04 11.05 10.37 10.71 10.87 10.75
\({\text{d}}B_z/{\text{d}}t\) 18.42 19.2 18.54 17.78 17.33 19.73 21.60 19.41 22.16 18.39 18.03 18.50
  1. The lead institute letter codes are provided in Table 1. LN refers to LPG Nantes which was not a lead institute for IGRF-13