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Ørsted Initial Field Model

Abstract : Magnetic measurements taken by the Ørsted satellite during geomagnetic quiet conditions around Jan-uary 1, 2000 have been used to derive a spherical harmonic model of the Earth's magnetic field for epoch 2000.0. The maximum degree and order of the model is 19 for internal, and 2 for external, source fields; however, coefficients above degree 14 may not be robust. Such a detailed model exists for only one previous epoch, 1980. Achieved rms misfit is < 2 nT for the scalar intensity and < 3 nT for one of the vector components perpendicular to the magnetic field. For scientific purposes related to the Orsted mission, this model supercedes IGRF 2000.
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N Olsen, R Holme, G Hulot, T Sabaka, T Neubert, et al.. Ørsted Initial Field Model. Geophysical Research Letters, American Geophysical Union, 2000, 27 (22), pp.3607-3610. ⟨10.1029/2000GL011930⟩. ⟨insu-01410544⟩

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