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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 , F region
English physicist remembered for his studies of the ionosphere (1892-1966) Appleton , Edward Appleton , Sir Edward Victor Appleton
lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves D-layer , D region
region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length E layer , E region , Heaviside layer , Kennelly-Heaviside layer
acronym for emissions of light and very low frequency perturbations due to electromagnetic pulse sources; extremely bright extremely short (less than a msec) electrical flashes forming a huge ring (up to 400 km diameter) in the ionosphere elves
sky wave that is reflected by the ionosphere ionospheric wave
shortest distance that permits radio signals (of a given frequency) to travel from the transmitter to the receiver by reflection from the ionosphere skip distance
radio wave that is reflected back to earth by the ionosphere or a communications satellite; permits transmission around the curve of the earth's surface sky wave
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