Observations of the extreme ultraviolet nightglow

An extreme ultraviolet telescope system was flown on an Aerobee 170 rocket from the White Sands Missile Range on October 22, 1971. Measurements of extreme ultraviolet radiation from the night sky were made with a set of Parylene, aluminum, and tin filters behind a grazing incidence concentrator. If the aluminum and tin filter data are interpreted as being due to only the He I 584-Å and He II 304-Å lines, the nightglow flux at 25° zenith angle and 270° azimuth angle at 180-km altitude was I(584) = 4.4 ± 1.9 R and I(304) = 1.3 ± 0.5 R.