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Open Access

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

Earth, Planets and Space201452:BF03352345

Received: 21 February 2000

Accepted: 8 July 2000

Published: 24 June 2014


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.


Secular VariationRepeat StationGeomagnetic EquatorBritish Geological SurveyGeomagnetic Field Model