Discussion
Which ionospheric layer is responsible for daytime absorption at high frequencies?
Answer: C
The D layer, at around seventy to ninety kilometres, is dense enough that electrons collide frequently with neutral molecules, so energy taken from the wave is lost as heat rather than re-radiated. It absorbs strongly at low frequencies and disappears at night. The E and F layers refract rather than absorb. Distinguishing a refracting layer from an absorbing one is essential, since one carries the signal and the other destroys it.
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