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F layer
the two dense layers of ions in the F region of the ionosphere that are used to reflect long-range radio signals: the , at an altitude of c. 200 to 300 km (c. 125 to 185 miles), exists during the day, and the permanent , or Appleton layer, is at c. 225 to 400 km (c. 140 to 250 miles)
See F layer in American Heritage Dictionary 4
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