| Acronym | Meaning |
 | PEM | Particle Environment Monitor |
| MCTEX | Maritime Continent Thunderstorm Experiment |
| SDBE | Shear-Directed Balloon Experiment |
| PPM | Parts Per Million |
| PD | Positive Definite |
| 4DDD | Four-Dimensional Data Assimilation |
| MSISR | Millstone Hill Incoherent Scatter Radar |
| SCOPE | Scientific Committee On Problems Of The Environment |
| MGA | Meteorological And Geoastrophysical Abstracts |
| GSD | Geometric Standard Deviation |
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