| Acronym | Meaning |
 | SID | Sudden Ionospheric Disturbance |
| SSPO | Space Shuttle Program Office |
| HEAO | High Energy Astronomical Observatory |
| RESTEC | Remote Sensing Technology Center |
| ISU | International Space University |
| CASSINI | Saturn Orbiter And Titan Probe |
| OMDP | Orbiter Maintenance Down Period |
| DIRBE | Diffuse Infrared Background Experiment |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| IGY | International Geophysical Year |
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