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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