Considerable time shifts of the amplitude maxima of solar radio emission were recorded during solar flare X38 of January 17, 2005 at the European VHF stations spaced by a distance of 100 to 1000 km. It is shown on the basis of the model of polarization interference of radio-astronomical signals [1] that this phenomenon can be stipulated by the amplitude modulation of solar radio emission caused by the rotation of the polarization plane in the ionosphere (Faraday effect).