San Marco C-2 Post Launch Report No. 2

San Marco C-2 is declared a success based upon the results of the mission with respect to the approved prelaunch objectives. On February 18, 1974, San Marco C-2 was launched by a Scout vehicle from the San Marco Range into an elliptical equatorial orbit. The payload consisted of three scientific instruments, two U. S. and one Italian, designed to obtain measurements of the diurnal variations of the equatorial neutral atmosphere density, composition, and temperature and to use these data for correlation with Explorer 51 (AE-C) data for studies of the physics and dynamics at the thermosphere. After 23 months in orbit, more than 17 diurnal cycles of data on the density, composition, and temperature of the equatorial thermosphere have been obtained, clearly meeting the primary mission objectives. Both U.S. scientific instruments continue to acquire data but the Italian air drag balance, which malfunctioned shortly after launch, has never performed properly. Studies and correlations of data from AE-C and San Marco C-2 have begun and will continue as data acquired from the two satellites are processed and analyzed.