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Table 7 The RMS values of the differences between satellite and observatory input data and the three models, SARM, SACFM-2 and CHAOS-6 for the period 2005–2010

From: A harmonic spline magnetic main field model for Southern Africa combining ground and satellite data to describe the evolution of the South Atlantic Anomaly in this region between 2005 and 2010

Component

2005

2006

2007

2008

2009

2010

SAT–SARM

   \(\Delta X\) (nT)

28.1

27.0

24.0

22.3

24.6

29.4

   \(\Delta Y\) (nT)

16.0

16.2

17.0

16.2

15.9

16.9

   \(\Delta Z\) (nT)

16.2

14.0

14.6

13.1

13.3

16.1

SAT–SACFM-2

   \(\Delta X\) (nT)

10.2

10.7

10.0

11.1

11.7

12.3

   \(\Delta Y\) (nT)

6.9

5.2

5.6

7.1

6.9

8.1

   \(\Delta Z\) (nT)

4.8

3.6

4.7

4.8

5.1

5.2

SAT–CHAOS-6

   \(\Delta X\) (nT)

83.6

80.1

81.5

81.8

77.2

76.1

   \(\Delta Y\) (nT)

23.4

24.2

23.6

24.2

27.9

28.7

   \(\Delta Z\) (nT)

66.0

61.9

61.8

62.7

62.9

62.3

OBS–SARM

   \(\Delta X\) (nT)

150.0

134.4

123.8

119.7

117.8

122.4

   \(\Delta Y\) (nT)

61.0

55.8

57.9

54.9

43.1

54.1

   \(\Delta Z\) (nT)

122.9

146.4

167.1

165.7

164.7

167.5

OBS–SACFM-2

   \(\Delta X\) (nT)

4.5

6.3

3.5

4.2

4.5

6.6

   \(\Delta Y\) (nT)

2.6

1.9

2.5

6.7

2.4

2.9

   \(\Delta Z\) (nT)

2.1

2.1

1.9

2.6

2.3

2.3

OBS–CHAOS-6

   \(\Delta X\) (nT)

52.8

57.7

61.8

61.5

66.6

49.8

   \(\Delta Y\) (nT)

69.6

69.6

70.0

68.0

70.6

59.4

   \(\Delta Z\) (nT)

58.7

98.3

121.5

126.0

141.9

105.0

  1. In 2005 and 2010, only the input satellite or observatory data recorded after 2005.5 and before 2010.5 were used, respectively