A Spectrometer for Observations of the Solar Extreme Ultraviolet from the OSO-I Satellite

A spectrometer which has observed the EUV solar spectrum from the first orbiting solar observatory (OSO-I) is described, and the results are summarized. The unique problems which had to be overcome are discussed, and the ideas and methods used to solve those problems are described. A novel detector carriage, scanning drive, and electrical cable to the carriage, among other items, were developed. The satellite, optics and detector, data coding, mechanical plan, lubrication, satellite environment, thermal balance, testing program, and data reduction are also described. The OSO-I was the first satellite with pointed instruments and tape recorders for data storage.