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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)
- 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)
- d region the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
- edward appleton English physicist remembered for his studies of the ionosphere (1892-1966)
- ionospheric wave a sky wave that is reflected by the ionosphere
- skip distance the shortest distance that permits radio signals (of a given frequency) to travel from the transmitter to the receiver by reflection from the ionosphere
- d-layer the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves
- f 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