There is only one principal ionized layer at night.
Figure 8.
IONOSPHERE STORMS
Definition: Any marked or sudden deviation from normal conditions
of height or frequency.
Effect:
Normally reliable frequency may become useless. Signal
may weaken or "blackout".
Duration:
Several minutes to several weeks.
Tendency to repeat
every 27 days as the sun rotates.
storms
usually
originate
in
North
and
South
Polar
Regions.
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