noun
- The highest region of the ionosphere (from 90 to 600 miles up) which contains the highest concentration of free electrons and is most useful for long-range radio transmission.
- synonyms: Appleton layer, F region
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). f layer. Retrieved September 23, 2026, from http://smartdefine.org/f_layer/definitions/1274294 |
| Chicago | WordNet. 2010. "f layer" http://smartdefine.org/f_layer/definitions/1274294 (accessed September 23, 2026). |
| Harvard | WordNet 2010, f layer, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/f_layer/definitions/1274294>. |
| MLA | WordNet. "f layer" 23 October 2010. Web. 23 September 2026. <http://smartdefine.org/f_layer/definitions/1274294> |