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Table 2 Number of data points N and the Huber weighted mean and rms misfits (in nT for the satellite data and in nT/year for the ground observatory data) of the data to the CHAOS-5l parent field model

From: DTU candidate field models for IGRF-12 and the CHAOS-5 geomagnetic field model

   CHAOS-5l
Data Component N Mean rms
Ørsted F polar 121,293 0.46 3.44
  F nonpolar+B B 367,713 0.16 2.37
  B 87,672 −0.05 7.37
  B 3 87,672 0.15 3.35
  B r 87,672 0.13 4.47
  B θ 87,672 0.23 5.36
  B ϕ 87,672 0.00 5.03
CHAMP F polar 188,015 −0.37 4.90
  F nonpolar+B B 497,394 −0.09 2.07
  B 497,394 −0.02 3.30
  B 3 497,394 0.07 3.42
  B r 497,394 0.02 2.77
  B θ 497,394 0.10 3.56
  B ϕ 497,394 −0.01 2.71
SAC-C F polar 26,118 0.43 3.78
  F nonpolar 86,603 0.40 2.72
Swarm A F polar 17,485 −0.03 3.80
  F nonpolar+B B 53,137 −0.01 2.09
  B 53,137 −0.05 2.79
  B 3 53,137 0.05 2.72
  B r 53,137 −0.01 1.83
  B θ 53,137 0.18 2.95
  B ϕ 53,137 −0.16 2.69
Swarm B F polar 17,774 0.15 3.65
  F nonpolar+B B 53,253 −0.06 2.07
  B 53,253 −0.03 2.80
  B 3 53,253 0.08 2.84
  B r 53,253 −0.02 1.99
  B θ 53,253 0.22 3.00
  B ϕ 53,253 −0.13 2.71
Swarm C F polar 16,697 0.13 3.82
  F nonpolar+B B 49,984 0.05 2.09
  B 49,984 −0.05 2.80
  B 3 49,984 0.04 2.80
  B r 49,984 0.02 1.93
  B θ 49,984 0.11 3.00
  B ϕ 49,984 −0.15 2.71
Observatory d B r /d t 21,733 0.13 3.91
  d B θ /d t 21,733 −0.02 3.83
  d B ϕ /d t 21,733 −0.00 3.12
  1. Statistics for the vector components are given both in the coordinate system (B B ,B ,B 3) that is defined by the bore-sight of the star camera and the ambient field direction (cf. Olsen et al. 2000) and also in the standard geographic (ECEF) frame (B r ,B θ ,B ϕ )