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Table 8 The RMS values of the differences between geomagnetic repeat stations input data (GRS) and the three models, SARM, SACFM-2 and CHAOS-6 for the period 2005–2009

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
GRS–SARM
   \(\Delta X\) (nT) 156.3 166.9 172.4 174.3 167.6
   \(\Delta Y\) (nT) 124.2 119.3 121.8 130.0 120.3
   \(\Delta Z\) (nT) 216.3 193.5 190.4 194.0 169.1
GRS–SACFM-2
   \(\Delta X\) (nT) 10.0 9.1 6.9 10.7 7.8
   \(\Delta Y\) (nT) 7.8 4.9 6.4 7.4 6.9
   \(\Delta Z\) (nT) 9.2 4.8 5.4 6.9 8.1
GRS–CHAOS-6
   \(\Delta X\) (nT) 87.6 100.1 102.6 107.1 101.5
   \(\Delta Y\) (nT) 124.7 121.7 117.6 128.9 119.7
   \(\Delta Z\) (nT) 206.4 185.3 178.9 191.0 159.7
  1. The year 2010 is not included because the ground vector survey was carried out in the second half of the year, outside the interval where SACFM-2 is considered to be reliable