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Kennelly–Heaviside layer
The
Kennelly–Heaviside layer
, named after
Arthur E. Kennelly
and
Oliver Heaviside
, also known as the
E region
or simply the
Heaviside layer
, is a layer of
ionised
gas
occurring between roughly 90–150 km (56–93 mi) above the ground — one of several layers in the
Earth
's
ionosphere
. It reflects
medium-frequency
radio waves
, and because of this
reflection
,
radio waves
can be
propagated
beyond the
horizon
.
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