Abstract
A new type of whistler precursor found on a signal from the Siple VLF transmitter [ Paschal E. W. (1990) J. geophys. Res. 95, 225] is explained in terms of spectral-choosing backscattering of whistlers by periodic plasma density striations created by counter-propagating transmitter signals in the magnetosphere. At signal amplitudes of 2 mV/m the density modulation is shown to be δ n n 0 = 0.04% , corresponding to a coefficient of whistler backscattering, R = ¦ E ̃ 2 E 2 ¦ = 0.25 . The same mechanism can be used to explain ‘postcursor’ occurrence, assuming that backscattering takes place also for a whistler reflected from the ionosphere during the second pass through the interaction region.
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