Resolution No.10 (1975): World magnetic surveys by low-altitude satellite
IAGA, recognising that available surface data are not sufficient for the accurate definition of the main geomagnetic field, and noting that no satellite measurements useful for this purpose have been made since early 1971, and that none is definitively planned for the future, urges that world magnetic surveys by low-altitude satellite be conducted. Because of uncertainties in field models derived from scalar data alone, IAGA recommends that such surveys measure the field components with the appropriate accuracy. Furthermore, because of the critical importance of the secular variation in the definition of the main geomagnetic field. IAGA urges the prompt release of the data through the World Data Centers to the scientific community.