2001. 32. . 4


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The presented review is dedicated to the discussion of the problem on defining the microscopic nature of induced coherent radiation of the medium atoms which appears under the passing charged particle. This coherent radiation in optically transparent medium becomes observable under the condition when the phase velocity of its spreading turns out to be less than the velocity of the charged particle movement. It leads to a well-known macroscopic process when the directed Cherenkov radiation occurs. The history of clarifying the physical origin of this primary atomic radiation lying in the basis of the Cherenkov effect is discussed.