f layer

Noun
  1. 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 (synset 108599865)
    is an instance of: part, region - the extended spatial location of something
    is a part of: ionosphere - the outer region of the Earth's atmosphere; contains a high concentration of free electrons
    same as: appleton layer, f region

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