SOLA Geomagnetic Field estimates

Description of SOLA data product: The SOLA model estimates are expressed in terms of Schmidt semi-normalized spherical harmonics coefficients, in units of nanoTesla, of degree n and order m evaluated at a geocentric radius of 6371.2km. Coefficients are provided for the Secular Variation (SV, first time derivate of the field) and the Secular Acceleration (SA, second time derivative of the field). The estimates are given as txt files where the first row provides the different modeled epochs in fraction of years, and the second row provides mean error estimate for modeled epochs. Estimates are provided for two spatial resolutions: 1) SH degree 10 (45deg) and 2) SH degree 8 (50deg), which are the width of the resolution kernels. References: Hammer, M.D, Finlay, C.C, and Olsen, N. (2021) Applications for CryoSat-2 satellite magnetic data in studies of the Earth's core field variations. Earth, Planets and Space, 73:73. Hammer,M.D. and Finlay,C.C (2019) Local averages of the core-mantle boundary magnetic field from satellite observations, Geophys. J. Int., 216,1901-1918.