Describe, in detail, the reason for the observable change in AM radio reception.?

Question

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Answer 1

AM Radio has low enough frequency that at night the radio signals bounce off of our Atmosphere.  A layer of Earth's atmosphere called the Ionosphere.  This layer changes at night and thickens to where the frequencies on the AM band bounce up in the sky and comes back down sometimes 1000s of miles away.  But with the atmosphere always changing will cause fading in and out and a sort of flutter in the signal as well.  Some AM Radio stations have to lower there power at night to not interfere with other radio stations on the same frequency.  

Hope that helps -- All the best,

Bennie Dingo

Rock-it Radio