Calculations are presented of the actinic (spherically integrated) solar flux from 290 to 700 nm at solar zenith angles between 0 and 86 degrees. The calculated values are obtained by using a radiative transfer program (developed by Dave) that accounts for molecular scattering, ozone absorption, and aerosol scattering and absorption. Input data consists of aerosol size distribution, aerosol number and ozone concentrations as a function of height, aerosol index of refraction, and the following as a function of wavelength: ozone absorption coefficient, molecular scattering coefficient, solar constant, and surface reflectivity. The calculated actinic flux values are evaluated for their dependence on variations of surface reflectivity, aerosol amount, ozone amount and station elevation. The variation of the actinic flux with altitude above the surface is discussed with emphasis on the change through the lowest kilometer of the atmosphere. Finally, the flux values presented here are compared to those of Leighton (1961); the differences in the methodology and input data between the two studies are illustrated. These calculated actinic flux data are useful for estimating photodissociation rate constants for application to photochemical air pollution problems.

Tables. Includes appendices. "June 1976." Includes bibliographical references (pages 45-49).