Variations in Solar UV Spectral Irradiance and X-Ray Flux

摘要

Solar variations in the UV spectral irradiance are discussed with emphasis on the wavelengths important for producing or destroying ozone and heating the stratosphere. Short-term variations of days and weeks have now been well observed by the NIMBUS-7 and SME satellites. Progress in modeling the solar UV flux temporal variations based on solar spatial data is reviewed with emphasis on the role of modeling in intercomparing isolated measurements and for providing better UV estimates for past times than indices like the 10.7 cm solar radio flux or sunspot number can provide.