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The problem of radiation from a sheet current source in a moving compressible plasma is treated. In order to know the interaction between the sheet source and the moving plasma, first the sign of the radial component of the propagation constant is determined accurately on the basis of the radiation condition. Then the radiation power is investigated numerically for various sets of the direction of the source and that of the moving plasma. In particular, it is found that the source is given an energy by the surrounding plasma medium under certain conditions.