Measurements of the solar UV flux were made by spectrometers carried by the Atmosphere Explorer satellites over a period of several years, spanning an interval between solar minimum and solar maximum activity. A so-called ‘solar UV reference spectrum’ was acquired with a rocket borne spectrometer on 23 April 1974, identified in the table as day 113 of year 1974: 74/113. Table A2.1 lists the irradiance at the top of the atmosphere in photons (cm2sΔλ)−1 where Δλ = 50 Å. The intensities of several bright lines are listed individually, and the line sources are identified; these intensities are not included in the 50 Å bins. The irradiance obtained on five days between 1974 and 1979 is given in the wavelength region between 50 and 1050 Å which is subject to the largest variability with solar activity. Only the spectrum for day 74/113 is listed in Table A2.2 in the wavelength region 1050–1940 Å.