Abstract
The British Geological Survey (BGS) proposals for the revised International Geomagnetic Reference Field (IGRF) consisted of two main-field models (with maximum degree and order n ∗ = 10 ), for epochs 1950.0 and 1960.0, based on all available near-surface survey data collected between 1940 and 1965, and a predictive model (n ∗ = 8) of the secular variation for the interval 1985 to 1990 (mean epoch 1987.5), based on the most recent observatory annual means. This note briefly describes the data sets on which the models are based and the techniques used to derive them.
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