F region
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Letter F
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F region Definition
(n)
the
highest
region
of
the
ionosphere
(
from
90
to
600
miles
up
)
that
contains
the
highest
concentration
of
free
electrons
and
is
most
useful
for
long
-
range
radio
transmission
F region Synonyms
Appleton layer
F layer
F region
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