Parent magnetic field models for the IGRF-12GFZ-candidates

Earth, Planets and Space

Table 2 Satellite and observatory data weight parameters, residual means and rms

	Nb	σ			k	a	μ	rms
		A	B	C
Satellite
X _SM	122,286	3.4	3.2	3.2	1.0	0.55	0.01	2.76
Y _SM	122,286	3.3	3.4	3.3	1.0	0.55	0.00	2.87
Z _SM	122,286	5.4	5.4	5.5	1.0	0.55	−1.04	4.75
X _HL	276,916	10.0	10.0	11.0	0.7	0.30	0.56	25.77
Y _HL	276,916	11.3	12.2	6.5	0.7	0.30	0.13	28.14
Z _HL	276,916	11.0	11.0	7.0	0.7	0.30	0.04	13.76
X _{SM,Euler only}	89,461	3.4	3.2	3.2	1.0	0.55	−0.02	2.94
Y _{SM,Euler only}	89,461	3.3	3.4	3.3	1.0	0.55	0.01	2.76
Z _{SM,Euler only}	89,461	5.4	5.4	5.5	1.0	0.55	0.77	5.46
Observatories
X _SM	31,614	4.5			1.0	0.40	0.27	4.03
Y _SM	31,614	4.2			1.0	0.40	−0.22	3.95
Z _SM	31,614	7.0			1.0	0.40	−0.36	5.43
X _HL	8,007	14.0			0.9	0.30	−4.34	24.59
Y _HL	8,007	7.0			0.9	0.30	1.19	15.56
Z _HL	8,007	18.0			0.9	0.30	0.40	24.12

The first three rows for satellite and observatory data are mid- and low-latitude data, whereas the next three are for high-latitude data. The ‘ SM,Euler only’ data are used exclusively for calculating the Euler angles. Nb is the number of data values, σ is the prior standard deviation in nT, k and a are the weight parameters defined in Equation 12, and finally μ and rms are the data residuals mean and rms values, respectively (both in nT).