SOLAR HYDROGEN LYMAN-ALPHA VARIATION DURING SOLAR-CYCLE-21 AND SOLAR-CYCLE-22

A full-disk, line-integrated solar Lyman-alpha dataset is presented th at spans two solar cycles. The dataset is created partially from AE-E and SME data that is scaled to the Pioneer Venus Orbiter Ultraviolet S pectrometer (PVOUVS) upwind Lyman-alpha sky background data which is c onverted to a solar surrogate. PVOUVS measurements overlap AE-E, SME, and UARS observing periods and are calibrated to UARS/SOLSTICE irradia nce units at 1 AU. The scaled AE-E/SME, the SOLSTICE, and the PVOUVS s urrogate data in the interim between the satellites collectively form a composite dataset with a quiet sun value of 3.0+/-0.1x10(11) photons cm(-2) s(-1) common for three solar minima and a solar maximum value of 6.75+/-0.25x10(11) photons cm(-2) s(-1) common to cycles 21 and 22.