A model of the geomagnetic field and its secular variation for epoch 2000 estimated from Ørsted data

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CHAOS—a model of the Earth's magnetic field derived from CHAMP, Ørsted, and SAC‐C magnetic satellite data (2006, methodology): “A major improvement was possible by an analysis of the first 2 yr of Ørsted observations, which reduces the noise level to about 1 (nT yr−1)2 (blue curve, Olsen 2002); first time derivative coefficients up to n = 11 are resolved.”
3-D Global Induction in the Oceans and Solid Earth: Recent Progress in Modeling Magnetic and Electric Fields from Sources of Magnetospheric, Ionospheric and Oceanic Origin (2008, methodology): “1 global tidal model of Erofeeva and Egbert (2002), er is the outward unit vector and Br m is the radial component of the main magnetic field derived from the model of Olsen (2002).”
Extending comprehensive models of the Earth's magnetic field with Ørsted and CHAMP data (2004, methodology): “In fact, Olsen (2002) may have been more stringent in the C© 2004 RAS, GJI, 159, 521–547 tolerance of outliers than in this study.”