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> Regular Variations of Ionosphere.
Characteristics of the Ionosphere.
Figure 16.
Radio Wave Propagation and Antennas
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5.
Regular Variations of Ionosphere
.
a. General.
The
ionospheric layers
exist because of the sun's
activity.
The sun's state of activity will determine,
among
other
things, the critical
frequency
for each ionospheric layer.
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