Abstract A method of analysis is described which enables the velocity of each spatial Fourier component of a two-dimensional pattern to be calculated from records of the pattern obtained at two times. From the results, it is possible to determine whether the velocity is a function of the wavelength. This may be a useful method of analysis when it is suspected that dispersive wave motions play a part in the movements of the pattern. It should have applications to the study of ionospheric movements in experiments which use large arrays of aerials. The analysis may also have applications to other phenomena such as moving patterns of light emission from the night sky, observations of the form of the surface of the sea, and other geophysical phenomena in which moving patterns occur.
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