Abstract
It is shown that wind shear gradients in the meteor region can cause a scatter in the decay time of underdense radio meteor echoes. This model agrees well with the experimental observations of forward scatter radio meteors, but in the case of backscatter echoes the wind shear gradient component of the dispersion in the decay times is much smaller than that observed. It is shown that for backscatter echoes the dispersion in decay times is probably almost completely due to cosmic noise.

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