The Mount Wilson Observatory S-index of the Sun The Mount Wilson Observatory S-index of the SunDOI: info:10.3847/1538-4357/835/1/25v. 83525Egeland, Ricky, Soon, Willie, Baliunas, Sallie, Hall, Jeffrey C., Pevtsov, Alexei A., and Bertello, Luca. 2017. "The Mount Wilson Observatory S-index of the Sun." The Astrophysical Journal, 835 25. https://doi.org/10.3847/1538-4357/835/1/25.More...ID: 142320Type: articleKeywords: SAO