Solar ultraviolet spectra obtained from rockets flown on December 15,1952, February 21,1955, and June 4, 1956, are presented and analyzed over the wave-length range 2635-2085 A, together with an absolute spectral intensity-distribution-curve. In all, 538 absorption features were observed, and 949 atomic lines are listed as contributing to the observed spectrum.
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Malitson et al. (1960) studied this question.