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The Euler angles are co-estimated with the core field models.
Two core field models are derived from the Comprehensive Inversion chain (MCO_SHAi2C) and the Dedicated Core field chain (MCO SHAi2D).
Table 1 Mean (M) and root mean-squares (SD) misfit values for all data types and core field models, in nT.
(a) Mauersberger-Lowes spectra of the Gauss coefficients of the core field models; (b) degree correlation of the Gauss coefficients of the core field models; (c) Euler angle timeseries for each satellite (over the modelled four year lifetime of the mission); (d) correlation of the external dipole Gauss coefficients of the Comprehensive Inversion and 'Fast-track' magnetospheric models.
The data selection criteria used here are very similar to those used in the derivation of the first generation of GRIMM and have proven to lead to robust and accurate core field models.
Names containing: 'AUX ' are produced externally to the L2PS; 'IGR'CORCOR', and 'MCO ' are core field models; 'LIT ' and 'MLI ' are lithospheric field models, and 'MIO SHA 2C ' is an ionospheric field model.
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The dedicated core field model estimation is derived directly from the GFZ Reference Internal Magnetic Model (GRIMM) inversion and modeling family.
We will refer to this known core field model as the reference model.
The estimation of the core field model independently also requires several iterations.
which have to be minimised for the core field model Gauss coefficients.
The core field model is reasonably accurate over the data time span.
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