Earth, Planets and Space

Table 2 Number of data points N and the Huber weighted mean and rms misfits (in nT for the satellite data and in nT/year for the ground observatory data) of the data to the CHAOS-5l parent field model

From: DTU candidate field models for IGRF-12 and the CHAOS-5 geomagnetic field model

		CHAOS-5l
Data	Component	N	Mean	rms
Ørsted	F _polar	121,293	0.46	3.44
	F _nonpolar+B _B	367,713	0.16	2.37
	B _⊥	87,672	−0.05	7.37
	B ₃	87,672	0.15	3.35
	B _r	87,672	0.13	4.47
	B _θ	87,672	0.23	5.36
	B _ϕ	87,672	0.00	5.03
CHAMP	F _polar	188,015	−0.37	4.90
	F _nonpolar+B _B	497,394	−0.09	2.07
	B _⊥	497,394	−0.02	3.30
	B ₃	497,394	0.07	3.42
	B _r	497,394	0.02	2.77
	B _θ	497,394	0.10	3.56
	B _ϕ	497,394	−0.01	2.71
SAC-C	F _polar	26,118	0.43	3.78
	F _nonpolar	86,603	0.40	2.72
Swarm A	F _polar	17,485	−0.03	3.80
	F _nonpolar+B _B	53,137	−0.01	2.09
	B _⊥	53,137	−0.05	2.79
	B ₃	53,137	0.05	2.72
	B _r	53,137	−0.01	1.83
	B _θ	53,137	0.18	2.95
	B _ϕ	53,137	−0.16	2.69
Swarm B	F _polar	17,774	0.15	3.65
	F _nonpolar+B _B	53,253	−0.06	2.07
	B _⊥	53,253	−0.03	2.80
	B ₃	53,253	0.08	2.84
	B _r	53,253	−0.02	1.99
	B _θ	53,253	0.22	3.00
	B _ϕ	53,253	−0.13	2.71
Swarm C	F _polar	16,697	0.13	3.82
	F _nonpolar+B _B	49,984	0.05	2.09
	B _⊥	49,984	−0.05	2.80
	B ₃	49,984	0.04	2.80
	B _r	49,984	0.02	1.93
	B _θ	49,984	0.11	3.00
	B _ϕ	49,984	−0.15	2.71
Observatory	d B _r/d t	21,733	0.13	3.91
	d B _θ/d t	21,733	−0.02	3.83
	d B _ϕ/d t	21,733	−0.00	3.12

Statistics for the vector components are given both in the coordinate system (B _B,B _⊥,B ₃) that is defined by the bore-sight of the star camera and the ambient field direction (cf. Olsen et al. 2000) and also in the standard geographic (ECEF) frame (B _r,B _θ,B _ϕ)

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