| Acronym | Meaning |
 | AP | Anomalous Propagation |
| PC | Geomagnetic Pulsations |
| O AND M | Operations And Maintenance |
| OSV | Ocean Station Vessel |
| CAS | Committee On Atmospheric Sciences |
| AVN | Aviation Model At NCEP |
| IRS | Indian Remote-sensing Satellite |
| ISOC | Integrated Science Operations Center |
| ESA | Endangered Species Act |
| STEPS | Severe Thunderstorm Electrification And Precipitation Study |
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