Signals we get from natural radio sources are much weaker than man made signals. The strength of those signals are so small that astronomers use the different unit to measure their flux intensity called Jansky (1 Jy = \(10^{-26}Wm^{-2}Hz^{-1}\)). The above two figures show the power density of different radio astronomical signals and their spectrum which gives us the information related to their emission mechanism. There are three major types of radio emissions we observed in natural radio sources:
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