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Skywave
In
radio communication
,
skywave
or
skip
refers to the
propagation
of
radio waves
reflected
or
refracted
back toward Earth from the
ionosphere
, an
electrically charged
layer of the upper
atmosphere
. Since it is not limited by the curvature of the Earth, skywave propagation can be used to communicate beyond the
horizon
, at intercontinental distances. It is mostly used in the
longwave
frequency
bands.
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