Аннотация:A two-component model of short-wave (10-105 nm) solar emission shows that the intensity ratios of individual spectral lines depend only slightly on the activity level. Formulas are obtained which make it possible to calculate the spectrum and total flux of short-wave emission for any level of solar activity on the basis of flux measurements in the 58.4 nm line or measurements of radio emission at 10.7 cm. The results can be used for the simulation of processes in the earth's ionosphere and upper atmosphere.