| Acronym | Meaning |
| ICE | International Cometary Explorer |
| MAS | Millimeter-wave Atmospheric Sounder |
| LGA | Low Gain Antenna |
| ESA | European Space Agency |
| MJD | Modified Julian Date |
| OSSE | Oriented Scintillation Spectrometer Experiment |
| EUV | Extreme UltraViolet |
| ALEXIS | Array Of Low Energy X-ray Imaging Sensors |
| ISTS | Institute For Space And Terrestrial Science |
| GRTLS | Glide RTLS |