Summary-cont. - ss0130a0049

Summary. - ss0130a0048

Lesson 3 Practice Exercise - ss0130a0050

Principles of Radio Wave Propagation
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(2) Irregular variations in the ionosphere can adversely affect communications without any

advance warning Common irregular variations include sporadic E, sudden ionospheric disturbances, and

ionospheric storms.

3-11

SS0130

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