The CSES global geomagnetic field model (CGGM): an IGRF-type global geomagnetic field model based on data from the China Seismo-Electromagnetic Satellite

Earth, Planets and Space

Table 1 Residual statistics for all data used to produce the CGGM parent model (using the same convention as in Hulot et al. 2015a)

Residual statistics of the CGGM parent model
	N	Mean (nT)	RMS (nT)
F_P	30246	− 0.02	6.20
F_NP + B_B	184689	+ 0.29	2.60
F + B_B	214935	+ 0.26	3.16
B_B	122867	+ 0.47	2.67
\({B}_{r}\)	122867	+ 0.06	8.08
\({B}_{\theta }\)	122867	− 0.70	4.84
\({B}_{\varphi }\)	122867	+ 0.05	5.57

For each type of data, N is the number of data used, while Mean and RMS are the Huber-weighted misfit mean and Root-Mean-Square values (in nT); F_P refers to the misfit of the scalar data above (absolute) QD latitude 55° (polar latitudes), F_NP to the misfit of the scalar data below (absolute) QD latitude 55° (non-polar latitudes), F to the misfit of all scalar data, B_B to the misfit of the field component projected along the field direction (providing a measure of the misfit of the modulus of the vector data with respect to model prediction), and \({\mathrm{B}}_{\mathrm{r}}\),\( {\mathrm{B}}_{\uptheta }\), and \({\mathrm{B}}_{{\upvarphi }}\) refer to the three geocentric vector field components. Note that vector residuals provided here are reconstructed residuals propagated from the vector residuals minimized in the reference frame of the instrument. Recall that vector data are only used for (absolute) QD latitude below 20°