D-layer


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D-layer

(D-region) See ionosphere.
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The ground wave tends to follow the Earth's surface, while the sky wave is refracted back down towards the ground by the D-layer ionisation.
Studying the SID recorded over different paths also allows research into the characteristics of the D-layer and its response to the solar flare.
With the Sun absent at night, the D-layer vanishes; signal strength varies randomly and can often be quite high.