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Volume 52 Supplement 12

Special Issue: Geomagnetic Field Modelling and IGRF 2000

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


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.


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Correspondence to S. Macmillan.

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Macmillan, S., Quinn, J.M. The 2000 revision of the joint UK/US geomagnetic field models and an IGRF 2000 candidate model. Earth Planet Sp 52, 1149–1162 (2000).

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  • Secular Variation
  • Repeat Station
  • Geomagnetic Equator
  • British Geological Survey
  • Geomagnetic Field Model