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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