| Acronym | Meaning |
| SIM | Solar Interplanetary Model |
| ETCO | External Tanks Corporation |
| PMR | Pacific Missile Range |
| OSO | Orbiting Solar Observatory |
| UMASS | University Of Massachusetts |
| NGTG | NCAR GARP Task Group |
| IOS | Input/Output Subsystem |
| DD+ | Domestic Data Plus |
| ESMF | Earth System Model Framework |
| IRD | Interface Requirements Document |