 The new satellite-based CMSAF SARA, Solar Surface Radiation Aliosat, data record provides accurate and reliable measurements of solar surface radiation, making it ideal for regional climate monitoring and analysis, as well as for solar energy applications. Compared to its predecessor, the CMSAF Mviri Climate Data Record, SARA has shown significantly improved accuracy and homogeneity. This article was authored by Richard Muller, Uwe Pfeffroth, Christine Trager Chatterjee, and others.