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Table 5 The presentation of satellite data and computed data from the SACFM-2 and CHAOS-6 main field models for the Z component at four reference group points (G1, G2, G3 and G4) at selected epochs between 2005 and 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

  Col. (\(^\circ\)) Lon. (\(^\circ\)) Rad. (km) Epoch Satellite data SACFM-2 CHAOS-6
G1 111.6037 16.0703 6730.2202 2005.943 − 21,602 − 21,605 − 21,531
111.0930 16.6017 6736.3521 2006.825 − 21,525 − 21,532 − 21,453
111.0943 16.5997 6726.6172 2007.452 − 21,631 − 21,640 − 21,562
111.0807 16.5683 6717.5015 2008.126 − 21,727 − 21,738 − 21,661
111.0707 15.5057 6700.3765 2009.501 − 21,888 − 21,895 − 21,824
G2 108.0810 21.6857 6737.7280 2005.559 − 21,255 − 21,256 − 21,155
108.5707 21.0513 6741.6235 2006.353 − 21,277 − 21,278 − 21,184
108.1033 20.6020 6719.1484 2007.984 − 21,471 − 21,472 − 21,378
108.1257 21.5560 6707.0132 2008.787 − 21,598 − 21,601 − 21,497
108.6230 21.0797 6699.3726 2009.545 − 21,736 − 21,737 − 21,644
G3 118.6240 15.1830 6731.6548 2005.926 − 21,297 − 21,296 − 21,271
118.6183 15.0463 6737.7383 2006.778 − 21,222 − 21,225 − 21,201
118.0837 15.5720 6729.0352 2007.334 − 21,352 − 21,351 − 21,327
118.1008 15.5420 6706.0439 2008.877 − 21,527 − 21,530 − 21,505
118.1150 15.5390 6701.1177 2009.501 − 21,547 − 21,552 − 21,532
G4 119.5990 28.0930 6728.9092 2005.995 − 21,891 − 21,901 − 21,850
119.6070 28.1510 6743.4180 2006.329 − 21,771 − 21,774 − 21,737
119.1018 28.5980 6729.5313 2007.312 − 21,924 − 21,942 − 21,888
119.1053 28.5060 6712.1265 2008.497 − 22,056 − 22,067 − 22,017
119.0860 28.6050 6693.4595 2009.874 − 22,199 − 22,205 − 22,165
  1. The Z component values are in nT