Extreme ultraviolet line intensities from the Sun

Anextreme ultraviolet spectrometer experiment by University College London for observation of whole-Sun spectrum -line fluxes, and flown on Orbiting Solar Observatory-6, is described. Results for the four lines with absolute calibration, are show n for the first 6 months of flight, from August 1969 to February 1970. The mean fluxes for the 30.4, 53.7, 58.4 and 121.6 nm lines are 8.1 x 109 ± 35 % ph cm-2 s-1, 3.2 x 108 + 40% ph cm-2s-1, 2 .5 x 109+ 40% ph cm -2s-1, and 3 x 1011 ± 50% ph cm-2 s-1 respectively. Relations between these fluxes and the 10.7 cm radio flux and Zurich sunspot number are presented.