| Acronym | Meaning |
 | PPM | Part Per Million |
| HIRES | HIgh RESolution |
| FSL | Forecast Systems Laboratory (a NOAA ERL) |
| IMAPP | International MODIS/AIRS Processing Package |
| AOT | Aerosol Optical Thickness |
| ESMR | Electrically Scanning Microwave Radiometer |
| DXS | Diffuse X-ray Spectrometer |
| ERBS | Earth Radiation Budget Satellite |
| CERES | Clouds And The Earth's Radiant Energy System (EOS) |
| ACRIM | Active Cavity Radiometer Irradiance Monitor (EOS) |
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