Number Degree/Order Model Name of Coeff. Main 1. 2. 3. Data Base Epoch Jensen, Cain 48 6 1945 - 1962 1960 GSFC 9/65 147 9 6 1945 - 1964 1960 GSFC 12/66 360 10 10 10 1900 - 1966 1960 GSFC 9/80 462 13 13 6 4 OGO, MAGSAT, 1960-1980 1980 GSFC 12/83 367 14 11 MAGSAT, 1978-1982 1980 GSFC 11/87 448 14 14 DE, MAGSAT, 1978-1983 1982 POGO 3/68 198 9 9 OGO 1960 POGO 10/68 286 11 11 OGO 1960 POGO 8/69 240 10 10 OGO 1965.7 to 1968.4 1960 POGO 8/71 240 10 10 OGO Dec. 1965 to Mar.1970 1960 MGST 6/80 195 13 MAGSAT Nov. 5-6, 1979 1979.85 MGST 4/81 258 13 7 MAGSAT 15 days 1980 Barraclough-75 296 12 8 6 Aircr., OGO, Obs. 1975 USGS, ACW75 248 12 8 1967-1974 1975 USGS, Cont. U.S. 24 4 Land, Marine, Aerial 1985 USGS, Hawaii 8 2 Surveys, IGRF 1985 IGRF, 1995 120 10 All Data Sources 1945-95
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NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility