| Acronym | Meaning |
 | AOC | Area Of Concern |
| ARBI | Adjusted Running Book Inventory |
| FP | Plasma Frequency |
| AP | Action Plan |
| EF | Error Function |
| CDDIS | Crustal Dynamics Data Information System |
| IMP | Interface Message Processor ARPANET |
| PROFS | Program For Regional Observing And Forecasting Services |
| AIDS | Activity Information Data Systems |
| USGCRP | United States Global Change Research Program |
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