Ørsted Initial Field Model

N Olsen (1) , R Holme (2) , G Hulot (3) , T Sabaka (4) , T Neubert (5) , C Toffner-Clausen (5) , P Primdahl (1, 5) , J Jorgensen (6) , J. M. Léger (7) , D B Barraclough (8) , J B Bloxham (9) , C Cain (10) , C Constable (11) , V Golovkov (12) , J A Jackson (13) , P. Kotze (14) , B. Langlais (3) , M M Macmillan (8) , M M Mandea (3) , C Voorhies , M M Merayo (6) , L Newitt (15) , M M Purucker (16) , T Risbo (17) , M. Stampe (1) , A. Thomsons. (16)

1 DSRI - Danish Space Research Institute
2 GFZ - GeoForschungsZentrum - Helmholtz-Zentrum Potsdam
3 IPGP - Institut de Physique du Globe de Paris
4 GSFC - NASA Goddard Space Flight Center
5 DMI - Danish Meteorological Institute
6 Institute for Automation, DTU, Lyngby, Denmark
7 CEA-Direction des Technologies Avancées,France
8 British Geological Survey [Edinburgh]
9 Harvard University, Cambridge MA, USA
10 FSU - Florida State University [Tallahassee]
11 UC San Diego - University of California [San Diego]
12 IZMIRAN - Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation
13 University of Leeds
14 Hermanus Magnetic Observatory
15 NRCan - Natural Resources Canada
16 Planetary Geodynamics Laboratory [Greenbelt]
17 UCPH - University of Copenhagen = Københavns Universitet

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.

Domains: Geophysics [physics.geo-ph]

N Olsen, R Holme, G Hulot, T Sabaka, T Neubert, et al.. Ørsted Initial Field Model. Geophysical Research Letters, 2000, 27 (22), pp.3607-3610. ⟨10.1029/2000GL011930⟩. ⟨insu-01410544⟩