COMPARISON OF CANDIDATE MODELS FOR DGRF-1990 AND IGRF-1995

The 1995 revision of the International Geomagnetic Reference Field (IC RF) includes a definitive main-field model for 1990.0, a main-field mo del for 1995.0, and a forecast secular variation model for the interva l 1995-2000. The four 1990.0 main-field models and four 1995.0 main-fi eld models that were proposed as candidates have been evaluated by com paring them one with another, and also with magnetic observatory data. The comparisons indicate that the accuracies of the main-field models proposed by IZMIRAN are one and a half times higher than those of the other candidate models. The two secular variation models that were pr oposed have also been compared; averaging of the two models is appropr iate.