DERIVATION AND ANALYSIS OF THE MAIN GEOMAG- NETIC FIELD MODELS IN CHINA FOR 1950-1980

In this paper, the main geomagnetic field models in Chinese region at epochs 1950.0, 1960.0, 1970-0 and 1980.0 were derived, and the characteristics of main geomagnetic field polynomial model in local region were analysed. On the basis of the main geomagnetic field models, the geomagnetic maps for 1950.0 to 1980.0 were constructed.