| Acronym | Meaning |
 | GTMS | Global Thermospheric Mapping Study |
| ALPTRAC | Part Of EUROTRAC |
| AIMR | Airborne Imaging Microwave Radiometer |
| CBO | Congressional Budget Office |
| ASTIA | Armed Services Technical Information Agency |
| ISM | In Situ Measurements |
| ISO | International Standards Organization |
| ONERA | Office National D'Etudes Et De Recherches Aerospatiales |
| DERF | Dynamic Extended Range Forecasting |
| NSF | National Science Foundation |
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