Some Experimental Results on the Polarization of Ionospheric Echoes

The results of polarization studies with reference to four aspects of ionospheric propagation are presented. The observed polarizations of pulsed radiowaves suffering successive reflections between the ground and the ionosphere confirm the deductions from the magneto-ionic theory. The polarization characteristics of echoes resulting from M-type reflections are described. Polarization measurements in relation to the group delay of the echoes show that there is no dependence whatsoever for the polarization of echoes on their group delay. Measurements of well-resolved magneto-ionic components on ionospherically disturbed days show no deviations of the polarizations from the normal values.