Resolution No.6 (1983): Geomagnetic data for IGRF1990

IAGA will issue a revision of the International Geomagnetic Reference Field extending it from 1985 to 1990 and recognising the crucial importance of recent data on secular variation for the accuracy of the revision, asks geomagnetic program directors to make an extraordinary effort to transmit their most recent data related to secular variation, including magnetic observatory mean values for 1983 and repeat survey results, to the World Data Centers before July 1, 1984.