Stratospheric Aerosol and Gas Experiment (SAGE) I gathered data concerning the spatial distribution of stratospheric aerosols, ozone and nitrogen dioxide on a global scale. SAGE I used a Sun Photometer.
Newchurch MJ, Cunnold DM, Cao J (1998). Intercomparisons of Stratospheric Aerosol and Gas Experiment (SAGE) with Umkehr [64] and Umkehr [92] ozone profiles and time series: 1979-1991. Journal of Geophysical Research, 103 (D23), 31277. https://doi.org/10.1029/98JD02440