TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 52 (No. 12), pp. 1149-1162, 2000

The 2000 revision of the joint UK/US geomagnetic field models and an IGRF 2000 candidate model

S. Macmillan1 and J. M. Quinn2

1British Geological Survey, Murchison House, West Mains Road, Edinburgh, EH9 3LA, Scotland
2United States Geological Survey, MS 966, Federal Center, Denver, CO 80225-0046, U.S.A.

(Received February 21, 2000; Revised June 27, 2000; Accepted July 8, 2000)

Abstract: The method of derivation of the joint UK/US spherical harmonic geomagnetic main-field and secular-variation models is presented. Early versions of these models, with the main field truncated at degree 10, are the UK/US candidates for the IGRF 2000 model. The main-field model describes the Earth's magnetic field at the 2000.0 epoch, while the secular-variation model predicts the evolution of this field between 2000.0 and 2005.0. A revised 1995.0 main-field model was also generated. Regional models for the continental US, Alaska and Hawaii were also produced as a by-product of the UK/US global modelling effort.

Corresponding author E-mail: S.Macmillan@bgs.ac.uk

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