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
   - Appleton layer, F layer

Type of: part, region

Part of: ionosphere

Encyclopedia: F region

• asyndetic
• asyndeton
• asynergia
• asynergic
• asynergy
• asystole
• at
• at a loss
• at a low price
• at a lower place
• at a time
• at all
• at all costs
• at an equal rate
• at any cost
• at any expense
• at any rate
• at arm's length
• at bay
• at best
• at bottom
• at close range
• at fault
• at first
• at first blush