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RE: Ionospheric Layers: Description, Constituents, anomalies and Effect on Radio Wave Propagation
Yes right...In addition the disappearance of the A.M signal is also due to the fact that the D layer attenuates low frequency signals which is a factor of the ionization present in this layer. When this layer is no longer there at night, A.M frequency can take advantage of their relatively long wavelength and travel farther than F.M