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radio fadeout[′rād·ē·ō ′fād‚au̇t]
Increased absorption of radio waves passing through the lower layers of the ionosphere due to a sudden and abnormal increase in ionization in these regions; signals at receivers then fade out or disappear. Also known as fadeout.
A type of fading in which the received signal strength is reduced to a value below the noise level of the receiver. The most common cause of fadeout is a disturbed ionosphere. Also called a radio fadeout, Dellinger effect, or Mögel-Dellinger effect.