The solar EUV flux between 230 and 1220 Å on November 9, 1971

The solar flux in the wavelength interval 230 to 1220 A is reported from the results of a dual spectrometer flown aboard an Aerobee 150 rocket at the White Sands Missile Range, New Mexico, on November 9, 1971. The instrument consisted of two grazing incidence spectrometers in a single housing. One spectrometer recorded the solar flux between 230 and 1220 A, while the other recorded the altitude variation in intensity of four solar emission lines to determine the corrections to the solar flux data for atmospheric absorption. Calibration included determination of the quantum yield of the tungsten photodiode, which was used as a reference standard, by comparison with a National Bureau of Standards Al/sub 2/O/sub 3/ windowless photodiode. The 230- to 1220-A solar flux results are in agreement with those reported by Heroux et al., 1974.