The GRACE-FO mission is a dedicated gravity field mission. Since the satellites carry two fluxgate magnetometers each, these have been calibrated and characterized for pertubations. The standard deviation of geomagnetic quiet time residual with high-performance geomagnetic field model (CHAOS7) is below 10 nT.
WARNING: The Field-Aligned Currents (FAC) dataset (v0201) is invalid since June 4th, 2020 and will not be continued. An updated FAC (v0202) is available now for the whole mission duration and replaces v0201.
A detailed study has been published here:
Stolle, C., Michaelis, I., Xiong, C. et al. Observing Earth’s magnetic environment with the GRACE-FO mission. Earth Planets Space 73, 51 (2021). doi.org/10.1186/s40623-021-01364-w
The data has been published here:
Michaelis, Ingo; Stolle, Claudia; Rother, Martin (2021): GRACE-FO calibrated and characterized magnetometer data. V. 0201. GFZ Data Services. https://doi.org/10.5880/GFZ.2.3.2021.002
and is available at
A new study using Machine Learning methods has been published here:
K. Styp-Rekowski, C. Stolle, I. Michaelis and O. Kao, "Calibration of the GRACE-FO Satellite Platform Magnetometers and Co-Estimation of Intrinsic Time Shift in Data," 2021 IEEE International Conference on Big Data (Big Data), 2021, pp. 5283-5290, doi: 10.1109/BigData52589.2021.9671977.