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The problem of the motion of high-energy wave packets combined of freeelectromagnetic waves is considered. It is demonstrated that the transformationof such packets to the packet of spherically diverging waves happens on longdistances along the packet's motion direction, that substantially exceed theradiated wavelength. The transition radiation by the ``half-bare''ultrarelativistic electron is considered. It is demonstrated that thetransition radiation by such an electron on the targets located inside andoutside the coherence length of the radiation process would be substantiallydifferent.

On the motion of high-energy wave packets and the transition radiation by "half-bare'' electron