| NOUN | location | Appleton layer, F layer, F region | 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 |
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| Meaning | 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. | |
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| Synonyms | F layer, F region | |
| Instance of | region, part | The extended spatial location of something |
| Part of | ionosphere | The outer region of the Earth's atmosphere |
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