Appleton layer (0 synonym found)
Definition of Appleton layer:

(n) : 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
Definition of Appleton layer:

(n) : 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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