| Acronym | Meaning |
| MSISR | Millstone Hill Incoherent Scatter Radar |
| MM90 | N/A |
| ATLAS | Atmospheric Laboratory For Applications And Science |
| MCC | Mesoscale Convective Complex |
| IRI | International Research Institute For Climate Prediction |
| HB | Hard Black |
| FR | Federal Register |
| PFU | Proto Flight Unit |
| EETFC | Environmental Effects |
| PRECP | Processing Of Emissions By Clouds And Precipitation |