| Acronym | Meaning |
| PHA | Physics And Astronomy |
| MLS | Microwave Limb Sounder |
| FAST | Fast Auroral SnapshoT Explorer |
| LEST | Large Earth-based Solar Telescope |
| ENACEOS | ENAC For EOS |
| SWAN | Solar Wind Anisotropy Experiment |
| HALOE | Halogen Occultation Experiment |
| FOS | Faint Object Spectrograph |
| GHA | Greenwich Hour Angle |
| TRMM | Tropical Rainfall Measuring Mission |