ESS220
Prof. Jin-Yi Yu
Ionosphere and AM Radio
qThe D- and E-layers absorb AM radio, while the F-layer reflect radio waves.
qWhen night comes, the D-layer disappears and the E-layer weakens. Radio waves are able to reach the F-layer and get reflected further.
qThe repeated refection of radio waves between Earth surface and the F-layer allows them to overcome the effect of Earth’s curvature.
(from
Understanding Weather & Climate)