Abstract
A tenth degree and order spherical harmonic model of the main geomagnetic field for 1980 has been derived using MAGSAT data supplemented by aeromagnetic vector data collected by the Project MAGNET aircraft. A secular variation model of degree and order 8 for 1982.5 based on magnetic observatory and repeat station measurements has also been developed. The secular variation model is used to project the 1980 main-field model to 1985. The 1980 and 1985 main-field models are proposed for incorporation into the revised International Geomagnetic Reference Field.
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