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Table 3 Number of data (vector triples counted as one) by type, and the mean and root-mean-square (RMS) misfits between model and data

From: The BGS candidate models for IGRF-13 with a retrospective analysis of IGRF-12 secular variation forecasts

  # Vector # Scalar Mean [nT] RMS [nT]
B\(_{N}\) B\(_{E}\) B\(_{C}\) F B\(_{N}\) B\(_{E}\) B\(_{C}\) F
Swarm 1,827,440 2,907 0.03 0.00 0.00 − 0.30 2.69 1.62 1.05 2.23
Swarm\(_{L}\) 569,641 447 0.02 0.00 0.00 − 0.28 2.03 1.06 0.60 1.65
Swarm\(_{H}\) 1,257,799 2,460 0.09 0.01 0.01 − 0.35 4.57 3.37 1.92 3.92
Obs. 130,571 47,546 0.00 0.00 0.00 0.01 1.49 0.90 1.01 3.33
Swarm A\(_{L}\) 190,241 90 0.03 − 0.02 − 0.01 − 0.06 1.91 1.00 0.58 0.72
Swarm A\(_{H}\) 419,651 478 0.09 0.01 0.01 − 0.27 4.32 2.64 1.93 2.08
Swarm B\(_{L}\) 190,899 331 0.00 0.00 0.00 − 0.40 2.27 1.01 0.60 1.85
Swarm B\(_{H}\) 419,743 1,900 0.10 0.02 0.01 − 0.39 4.81 4.31 1.80 4.69
Swarm C\(_{L}\) 188,501 26 0.03 0.03 − 0.01 0.83 1.93 1.24 0.62 1.20
Swarm C\(_H\) 418,405 82 0.10 0.01 0.01 − 1.04 4.63 3.87 2.05 6.26
  1. Misfit values are weighted by prior data covariance and the final Huber weighting of residuals. Satellite data with subscript ‘L’ indicate data at GMD latitudes below |55\(^\circ \)|, values with subscript ‘H’ indicate data at GMD latitudes above |55\(^\circ \)|. Observatory vector and projected scalar data are only used in the regions below and above |55\(^\circ \)| GMD latitude, respectively. Residuals are in NEC coordinates