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

Earth, Planets and Space

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

	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