ionospheric scatter

ionospheric scatter

[‚ī‚än·ə′sfir·ik ′skad·ər]
(communications)
A form of scatter propagation in which radio waves are scattered by the lower E layer of the ionosphere to permit communication over distances from 600 to 1400 miles (1000 to 2250 kilometers) when using the frequency range of about 25 to 100 megahertz.