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The International Geomagnetic Reference Field (IGRF) is due to be updated from the beginning of the year 2000. IAGA Working Group V-8, for analysis of the global and regional geomagnetic field and its secular variation, is seeking the following candidate spherical harmonic models: a main field model for the year 2000 (IGRF 2000) with the expected maximum degree and order m=n=10 a secular variation model for the interval 2000–2005 with the expected maximum degree and order m=n=8