Usually means: Ionospheric layer reflecting radio waves.
Definitions Related words Mentions
We found 12 dictionaries that define the word appleton layer:

General (10 matching dictionaries)
  1. Appleton layer: Merriam-Webster
  2. Appleton layer: Collins English Dictionary
  3. Appleton layer: Vocabulary.com
  4. appleton layer: Dictionary.com
  5. Appleton layer: Wikipedia, the Free Encyclopedia
  6. Appleton layer: Rhymezone
  7. appleton layer: FreeDictionary.org
  8. appleton layer: Mnemonic Dictionary
  9. Appleton layer: TheFreeDictionary.com
  10. Appleton layer: Merriam-Webster

Computing (1 matching dictionary)
  1. Appleton layer: Encyclopedia

Science (1 matching dictionary)
  1. Appleton Layer: Extragalactic Astronomy

(Note: See appleton_layers as well.)

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Definitions from WordNet (Appleton layer)

▸ noun:  the highest region of the ionosphere (from 90 to 600 miles up) that contains the highest concentration of free electrons and is most useful for long-range radio transmission


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