Solar ultraviolet irradiances on December 7, 1983, and December 10, 1984

The full-disk absolute solar irradiance was measured on Dec. 7, 1983, and Dec. 10, 1984. The first flight obtained data over the wavelength interval 150-260 nm, while the second obtained data from 150 to 340 nm. Absolute accuracy of the measurements varied from + or - 3 to + or - 9 percent, depending on the flight and the particular wavelength. Between 200 and 240 nm the results reported here are higher than previously reported irradiances, but there is good agreement over the other wavelength intervals. Near 150 nm the change in the solar flux between these two flights did not exceed 7 percent. Aove 200 nm the change in the solar irradiance was not larger than the error bars of the measurement.