| Acronym | Meaning |
 | THEMIS | N/A |
| CAO | Central Aerological Observatory |
| OMR | Optical Mark Reader |
| LFM | Limited-area Fine Mesh |
| SMRP | Satellite And Mesometeorology Research Project |
| CAPS | Center For The Analysis And Prediction Of Storms |
| NTCC | Nimbus Technical Control Center |
| SID | Sudden Ionospheric Disturbance |
| GPS CORS | Global Positioning System Continuously Operating Reference Stations |
| GDPS | Global Data Processing System |
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