USING SATELLITE MAGNETIC SURVEY DATA FOR SPATIAL-TEMPORAL MODELING OFTHE GEOMAGNETIC SECULAR VARIATION

The method of natural orthogonal components (NOC) analysis, which sepa rates temporal variations, and spherical harmonic analysis, which mode ls spatial distribution, were combined to model the spatial-temporal v ariations of the geomagnetic field over the globe. NOC's obtained in t his way describe the temporal variations year by year without smoothin g. Use of combined observatory and satellite magnetic survey data for developing a spatial-temporal model of equal accuracy on the globe and over the time interval of the data is proposed.