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In this paper the author has reviewed the state of art in estimating the radio frequency noise from the environment of a hypersonic vehicle and has pointed out areas requiring considerable effort. It can be safely said that the radiation due to the incoherent processes is less than that due to a corresponding black body. The possible mechanisms for excitation of and radiation by plasma oscillations need further investigation before anything conclusive can be stated regarding their role in the emission of RF noise. A conjecture has also been made about mechanisms for coherent radiation.