Magnetic field measurements on the Prognoz satellites were carried out by IZMIRAN's Space Magnetic Research Laboratory (SMRL) in 1977-1984. Satellites had the orbits with apogees ranging from 200000 to 800000 km. (3 - 125 Re). Prognoz-6 provides important solar wind observations during ISEE-1/2 first orbits on the day side magnetopause, at a time when ISEE-3 had not yet been launched. Prognoz-7 and -9 provide observations at a later stage of the ISEE mission. It is important also to note that Prognoz-7 was launched into a high latitude orbit, and provides extensive observations of the rarely explored cusp and mantle.
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