[1] Aerosol single scattering albedo (wo) is a primary factor dictating aerosol radiative effect. Ground-based remote sensing of wo has been employed most widely using spectral sky radiance measurements made from a scanning Sun photometer. Reliable results can be achieved for high aerosol loadings and for solar zenith angle >50 . This study presents an alternative method using spectral direct r...

Abstract The X-ray Photometer System (XPS) is one of four instruments onboard NASA’s Solar Radiation and Climate Experiment (SORCE) mission. SORCE spacecraft operated from 2003 to 2020 provide key climate-monitoring measurements total solar irradiance (TSI) spectral (SSI). XPS a set photometers measure the ultraviolet (XUV) shortward 34 nm bright hydrogen emission at 121.6 nm. Each photometer h...