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G3A02

What effect does a Sudden Ionospheric Disturbance have on the daytime ionospheric propagation of HF radio waves?

Select	Answer
A	It disrupts signals on lower frequencies more than those on higher frequencies
B	None, because only areas on the night side of the Earth are affected
C	It enhances propagation on all HF frequencies
D	It disrupts communications via satellite more than direct communications

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