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Table 4 RMS values of the differences between SACFM-2 and CHAOS-6 secular variation models between 2005 and 2010 at 0.8 km altitude

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 2006.5 2007.5 2008.5 2009.5
dX/dt (nT/year) 3.7 4.3 4.2 10.1
dY/dt (nT/year) 6.6 3.8 3.2 3.7
dZ/dt (nT/year) 5.8 4.1 4.3 8.0
  1. These differences were computed using 684 data points over the modelled area. The secular variation values were computed by getting the change of the field between two consecutive epochs of 1 year interval (e.g. epochs 2006.0 and 2007.0 were used to get secular variation values at 2006.5 epoch)