ARESE_ER2_MAS is the MODIS Airborne Simulator Data taken aboard the ER-2 aircraft during the ARESE campaign. The ARM Enhanced Shortwave Experiment (ARESE) was conducted at the Department of Energy's ARM Southern Great Plains (SGP) Central Facility between September 22, 1995 and November 1, 1995. ARESE used a combination of satellite, aircraft, and ground observations to make highly accurate solar flux measurements at different altitudes throughout the atmospheric column. At the heart of this was a carefully stacked Twin Otter and Egrett cloud sandwich with the Otter at 1500 - 5000 feet and the Egrett at 43,000 feet overflown by an ER-2 flying at 65,000 feet.