The solar Lyman-&agr; emission, the MgII core-to-wing ratio, R(MgIIc/w), the 10.7-cm radio flux, F10.7, and the 1--8 ¿ X rays are compared during high solar cycle 21 activity from 1981--83. Daily variations of the Mg II and Lyman-&agr; ultraviolet (UV) lines are highly correlated. There is moderate linear correlation between these lines and F10.7 and poor linear correlation with 1--8 ¿ X rays. Power spectral analysis indicates that all four fluxes have 27-day periodicities due to solar rotation while the R(MgIIc/w) and Lyman-&agr; have noticeable 13-day periods in the datasets. F10.7 moderately represents the 27-day solar UV variations and represents to a lesser degree variations shorter than or longer than rotation variations. X rays are not represented by F10.7 on intermediate-term or shorter time-scales. ¿ American Geophysical Union 1989