Abstract
Explorer XVII, the first Aeronomy satellite, employed for instrument housing, a vacuum-tight stainless steel sphere, whose construction reflected the most useful and established ultra-high vacuum techniques. The sensors carried included ionization gages, magnetic mass spectrometers and electrostatic probes, each mounted in and projecting through the stainless steel shell. Accessory equipment to provide the necessary supporting functions for the experiments included a PCM telemetry system, a command and control system, and a silver-zinc battery power supply which provided for fifty hours of satellite operation over a period of 100 days commencing 3 April 1963. The quantity of data obtained greatly surpasses all previous rocket data, and provides new information about the atmosphere for altitudes and geographical locations not previously explored.
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