An ongoing program is being conducted to provide information on the solar and circumsolar radiation (the solar aureole) for application to concentrating solar energy systems. Four instrument systems are used to obtain detailed measurements of the solar and circumsolar intensity, both as a function of angular distance from the center of the sun, and as a function of wavelength. A method of inverting filtered measurements to obtain the energy contained within a given wavelength interval is presented. Comparisons are made between the atmospheric transmission code LOWTRAN and normal incidence data. The amount of circumsolar radiation and the dependence of circumsolar radiation on angular distance from the sun are discussed as a function of wavelength for selected atmospheric conditions.