Dictionary:Radial power spectrum

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An average of power spectra (amplitude squared) calculated in different azimuth directions. Usually plotted as the log of the radial power versus wavenumber. Values generally decline steeply for increasing wavenumber (representing deep and/or broad sources) and then decline more gently for larger wavenumbers (representing shallow localized sources). Source depth is given by the slope of the log power spectrum divided by 4π if wavenumber is expressed in cycles/unit distance.