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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