Skip to main content

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