Table 1 Residual statistics of IGRF-13 parent models. Columns show the number of data points (N), residual mean (\(\mu\)) and residual standard deviation (\(\sigma\)). Low-latitude residuals are computed from data equatorward of \(\pm 55^{\circ }\) QD latitude. High-latitude residuals are computed from data poleward of \(\pm 55^{\circ }\) QD latitude
From: NOAA/NCEI and University of Colorado candidate models for IGRF-13
DGRF-2015 | IGRF-2020 | |||||
|---|---|---|---|---|---|---|
N | \(\mu\) (nT) | \(\sigma\) (nT) | N | \(\mu\) (nT) | \(\sigma\) (nT) | |
Swarm A | ||||||
\(B_x\) | 45020 | 0.68 | 3.11 | 69309 | 0.81 | 2.97 |
\(B_y\) | 45020 | − 0.02 | 3.13 | 69309 | 0.12 | 2.80 |
\(B_z\) | 45020 | 0.06 | 1.76 | 69309 | 0.11 | 1.65 |
Low-latitude \(|{\mathbf {B}}|\) | 45024 | 0.16 | 2.00 | 69312 | 0.16 | 1.93 |
High-latitude \(|{\mathbf {B}}|\) | 21995 | 0.28 | 6.64 | 33296 | 0.30 | 7.28 |
Swarm B | ||||||
\(B_x\) | 41290 | 0.59 | 3.27 | 76715 | 0.87 | 3.22 |
\(B_y\) | 41290 | − 0.02 | 3.04 | 76715 | 0.08 | 2.86 |
\(B_z\) | 41290 | 0.12 | 1.87 | 76715 | 0.16 | 1.70 |
Low-latitude \(|{\mathbf {B}}|\) | 41448 | 0.13 | 1.97 | 76730 | 0.15 | 2.04 |
High-latitude \(|{\mathbf {B}}|\) | 21441 | 0.40 | 5.88 | 33293 | 0.42 | 6.41 |