Table 4 Root-mean-square vector field differences \(_{i,j}T\) in units nT between IGRF-2020 candidate models and also between candidates and the arithmetic mean reference models M, median reference model \(M_{\text{med}}\) and robust Huber-weighted model in the rightmost columns
From: Evaluation of candidate models for the 13th generation International Geomagnetic Reference Field
\(_{i,j}T\)/nT | B | CE | CM | CU | D | G | IP | IS | IZ | N | P | S | M | \(M_{\text{med}}\) | Robust |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
B | 0.0 | 11.6 | 11.2 | 8.9 | 6.1 | 14.3 | 5.5 | 9.4 | 10.2 | 7.4 | 7.2 | 14.5 | 4.61 | 5.09 | 4.69 |
CE | 11.6 | 0.0 | 14.7 | 11.9 | 11.2 | 19.5 | 12.7 | 15.7 | 13.9 | 11.0 | 12.5 | 18.1 | 10.56 | 11.14 | 10.60 |
CM | 11.2 | 14.7 | 0.0 | 12.2 | 9.8 | 19.1 | 10.8 | 12.8 | 10.9 | 11.3 | 9.3 | 13.8 | 8.62 | 8.93 | 8.97 |
CU | 8.9 | 11.9 | 12.2 | 0.0 | 6.1 | 19.3 | 7.8 | 12.1 | 8.8 | 9.9 | 6.7 | 16.4 | 7.12 | 6.56 | 6.41 |
D | 6.1 | 11.2 | 9.8 | 6.1 | 0.0 | 17.1 | 4.8 | 10.0 | 6.4 | 8.5 | 3.6 | 14.0 | 3.69 | 2.48 | 2.95 |
G | 14.3 | 19.5 | 19.1 | 19.3 | 17.1 | 0.0 | 16.4 | 17.7 | 20.1 | 15.1 | 18.4 | 19.1 | 14.88 | 15.96 | 15.69 |
IP | 5.5 | 12.7 | 10.8 | 7.8 | 4.8 | 16.4 | 0.0 | 10.3 | 8.0 | 9.8 | 5.5 | 14.2 | 4.93 | 4.18 | 4.56 |
IS | 9.4 | 15.7 | 12.8 | 12.1 | 10.0 | 17.7 | 10.3 | 0.0 | 13.2 | 11.4 | 9.7 | 16.2 | 8.93 | 8.93 | 9.03 |
IZ | 10.2 | 13.9 | 10.9 | 8.8 | 6.4 | 20.1 | 8.0 | 13.2 | 0.0 | 11.7 | 6.2 | 14.8 | 7.69 | 6.66 | 6.98 |
N | 7.4 | 11.0 | 11.3 | 9.9 | 8.5 | 15.1 | 9.8 | 11.4 | 11.7 | 0.0 | 9.7 | 14.3 | 6.42 | 7.62 | 6.71 |
P | 7.2 | 12.5 | 9.3 | 6.7 | 3.6 | 18.4 | 5.5 | 9.7 | 6.2 | 9.7 | 0.0 | 13.8 | 4.74 | 3.39 | 4.00 |
S | 14.5 | 18.1 | 13.8 | 16.4 | 14.0 | 19.1 | 14.2 | 16.2 | 14.8 | 14.3 | 13.8 | 0.0 | 12.14 | 12.84 | 12.70 |
Mean Diff | 9.7 | 13.9 | 12.4 | 10.9 | 8.9 | 17.8 | 9.6 | 12.6 | 11.3 | 10.9 | 9.3 | 15.4 | 7.86 | 7.81 | 7.78 |