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

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

  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
  1. 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).