Table 1 Earth conductivity profiles Figure File Name Apx. Depth Remarks References 1. Global Models 1939-69 LAPR39 0—1250 global Sq, Dst LAHIRI and PRICE, 1939; PRICE, 1973 RIKI50 0—1400 misc. data sources RIKITAKE. 1950; 1966 MCD057 0—2900 LAPR39 + secular change McDoNALD, 1957 CANT60 100—600 see ECKHARDT et a!. , 1963 CANTWELL, 1960 YUKU65 380—1900 ring current YUKUTAKE, 1965 BANK69 0—1700 ring current BANKS, 1969; 1972 2. Global Models 1970—74 BFRS70 100—700 Sq, Dst 27-d variations BERDICHEVSKY et a!. , 1970; 1973 PRKR70 0—3200 rework BANKS, 1969, data PARKER, 1970 SCJA72 0—1000 pulsations, bays, Sq, Dst SCHMUCKER and JANKOWSKI, 1972 BANK72 230—1250 model summary BANKS, 1972 JADY74 0—2951 Sq, 27-d, annual variations JADY, 1974 FAR074 300—1500 with BFRS70 FAINBERG and ROTANOVA, 1974 SCHM74 0—1000 see HAAK, 1980 SCHMUCKER, 1974 DMRB77 0—1450 all available data DMITRIEV et al. , 1977 Global Models 1974-1983 3. PRKN74 60-430 Sq PARKINSON, 1974 DUCM80 0—2900 annual means DUCRUIX et a!. , 1980 ISIK80 320—2020 Sq, Dst, annual, solar cycle ISIKARA, 1980 ACMC81 0—2875 secular impulse ACACHE et a!. , 1980 ROKI82 350—1200 various methods ROKITYANSKY. 1982 JAPA83 0—1200 Dst JADY and PATERSON, 1983 4. Pacific Models LAUN74 0—500 near Calif. ; see DRURY, 1978 LAUNAY, 1975 LARSEN, 1975 LAHA75 0—800 Hawaii 7-1350 FILL80 NE Pacific FILLOUX, 1980 LAW and GREENHOUSE, LWGR81 0—200 Juan de Fuca 1981 0—250 Juan de Fuca OLDENBURG et a!. , 1984 OLJA84 OLCA84 0-250 near Calif. OLDENBURG et al. , 1984 OLNC84 0—250 N. cent. Pacific OLDENBURG et ai.