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nounthe outer region of the Earth's atmosphere; contains a high concentration of free electronspart of:
Definition that contains ionosphere
- elves an 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
- appleton English physicist remembered for his studies of the ionosphere (1892-1966)
- appleton layer 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
- sky wave a 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
- kennelly-heaviside layer a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
- e layer a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
- f region 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
- e region a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
- heaviside layer a region of the ionosphere (from 50 to 90 miles up) that reflects radio waves of medium length
- sir edward victor appleton English physicist remembered for his studies of the ionosphere (1892-1966)