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cross modulation[¦krȯs ‚mäj·ə′lā·shən]
a phenomenon observed when radio waves are propagated in the ionosphere. In cross modulation the strong electric field of a powerful radio wave alters, or “disturbs,” the rate of motion of ionospheric electrons along with the wave’s own frequency of modulation and causes the amplitude modulation of other radio waves passing through this disturbed region of the ionosphere. The phenomenon is commonly called the Luxembourg effect.