Aug 5 1974
From The Space Library
NASA and the Office of Naval Research launched the world's largest unmanned balloon from Fort Churchill, Canada, carrying a 363-kg payload to 47 000-m altitude. The experiment, designed by Goddard Space Flight Center scientist Dr. Robert C. Hartman, measured position and electron spectra between 20 and 800 mev at the 1.2-millibar level. The helium-filled balloon, constructed of half-mil polyethylene, weighed 1360 kg and had a volume of 1.4 cu m and a 0.25-km dia. Launched and tracked with facilities of the Navy's Skyhook program, the balloon rose over Hudson Bay and moved westward 805 km. After 18 hrs, it descended to 30 km, where the payload was separated by radio command and parachuted to the ground. (Naval Research Reviews, Nov 74, 13)
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