am radio stations

Why many long distance so am radio at night?
I realized I can get at night I'm 100 kilometers radio stations me, why is that? Not available during the day
The sun breaks the molecules of the ionosphere in the upper atmosphere and tighten again when the sun goes down. During the day, the signal passes through the ionosphere fracture in space. At night the radio waves are deflected by the accumulation molecular in the ionosphere and return to earth. One can get broadcasts by the curvature of the earth this way.
Sound of Music | Central station Antwerp (Belgium)
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