| Acronym | Meaning |
| EO-ICWG | Earth Observation International Coordination Working Group |
| UMF | User Master File |
| MPI | Message Passing Interface |
| GHOST | Global Horizontal Sounding Technique |
| PPP | Parallelizing PreProcessor |
| OSO | Orbiting Solar Observatory |
| MTC | Main Trunk Circuit |
| NOAA | National Oceanic And Atmospheric Administration |
| HCSN | High-Capacity Satellite Network |
| FAC | Facilities Advisory Council |