Question

what is meant by frequency scintillation?​

Answer 1

Scintillations are the rapid fluctuations in the phase and amplitude of the wave. These are caused by local rapid variations in the refractive index of the medium through which the wave is traversing.

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Answer 2

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Meaning :-

These are the rapid fluctuations in the phase and amplitude of the wave.

Causes:-

These are caused by local rapid variations in the refractive index of the medium through which the wave is traversing.