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Table 1 Statistics for the differences between geomagnetic field measurements and IGRF-12, CHAOS-6 and POMME-10 models over Southern Africa regarding main field (a) and secular variation (b) for D, H, Z and F components

From: Statistical evaluation of global geomagnetic field models over Southern Africa during 2015

Model/component

IGRF-12

CHAOS-6

POMME-10

(a) Main field

 D

  RMS (min)

33.2

32.9

33.2

  Mean (min)

9.2

9.1

9.5

  σ (min)

32.3

32.1

32.2

  Skewness

−0.28

−0.3

−0.29

  Student’s t

0.077

0.08

0.069

  F-test

0.93

0.95

0.94

 H

  RMS (nT)

73.2

73.2

73.6

  Mean (nT)

−16.6

−13.3

−14.5

  σ (nT)

72.2

72.9

72.8

  Skewness

−0.25

−0.23

−0.23

  Student’s t

0.15

0.25

0.21

  F-test

0.99

0.99

0.99

 Z

  RMS (nT)

178.9

178.5

178.6

  Mean (nT)

−26.7

−17.9

−25.5

  σ (nT)

179.2

179.8

178.9

  Skewness

0.3

0.3

0.35

  Student’s t

0.35

0.53

0.37

  F-test

0.88

0.87

0.88

 F

  RMS (nT)

157.1

157.3

156.9

  Mean (nT)

−17.3

−10.8

−17.1

  σ (nT)

158.2

159.0

158.1

  Skewness

−0.64

−0.63

−0.70

  Student’s t

0.50

0.67

0.51

  F-test

0.96

0.95

0.96

(b) Secular variation

 D

  RMS (min/year)

1.6

1.17

1.35

  Mean (min/year)

1.13

0.46

0.82

  σ (min/year)

1.15

1.09

1.08

  Skewness

−1.56

−2.44

−2.02

  Student’s t

2.5E−07

1.1E−02

2.2E−05

  F-test

0.61

0.84

0.95

 H

  RMS (nT/year)

6.3

5.5

8.8

  Mean (nT/year)

2.0

1.78

7.08

  σ (nT/year)

6.1

5.27

5.32

  Skewness

−0.17

−0.64

−0.7

  Student’s t

4.3E−02

3.9E−02

2.6E−10

  F-test

0.44

0.84

0.94

 Z

  RMS (nT/year)

6.6

3.6

6.9

  Mean (nT/year)

−4.7

−0.95

6.32

  σ (nT/year)

4.7

3.53

2.92

  Skewness

0.16

0.14

0.15

  Student’s t

1.9E−07

9.6E−02

1.7E−16

  F-test

0.10

0.69

0.98

 F

  RMS (nT/year)

11.7

11.8

9.2

  Mean (nT/year)

5.5

−3.3

−1.9

  σ (nT/year)

10.4

11.8

9.1

  Skewness

−0.99

−0.5

−1.5

  Student’s t

2.2E−03

0.39

0.19

  F-test

2.9E−02

0.43

0.42

  1. Standard deviation values are presented by σ