| Acronym | Meaning |
 | PD | Positive Definite |
| RFF | Resources For The Future |
| IGE | International Group Elements |
| IUE | International Ultraviolet Explorer |
| ELVIS | Export Licensing Voice Information System |
| AM | Amplitude Modulation |
| ASPEA | Association Suisse Pour L'Energie Atomique |
| MISR | Multiangle Imaging Spectroradiometer |
| NSWP | National Space Weather Program |
| SEC | Science Executive Committee |
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