| Acronym | Meaning |
 | AFGL | Air Force Geophysics Laboratory |
| PCO | Polar Cap Observatory |
| SLPA | Sea-Level Pressure Anomaly |
| ETCE | Effects Of Tropical Convection Experiment |
| PD | Positive Definite |
| VIMHEX | Venezuela International Meteorological And Hydrological Experiments |
| BWIP | Basalt Waste Isolation Project |
| STERAO | Stratosphere-Troposphere Experiments |
| GPCP | Global Precipitation Chemistry Project |
| STEP | Solar Terrestrial Energy Program |
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