POLARIZATION CHARACTERISTICS OF AURORAL ECHOES AT 88.5 MC/S.
Scientific rept. no. 5,
KIRUNA GEOPHYSICAL OBSERVATORY (SWEDEN)
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The purpose of this investigation was to study the polarization characteristics of aurorally reflected radio waves at 88.5 Mcs. Horizontally polarized waves were transmitted and the aurorally reflected waves were received simultaneously on two orthogonally polarized antennas. The most important characteristics of this investigation are summarized as follows 1 During all strong period of auroral activity the reflected signals were found to be strongly depolarized, but the amplitude of the vertically-polarized echo never exceeded that of the horizontal component. 2 The polarization of the reflected waves was often rather irregular with polarization components tilted in different directions. 3 Great and sudden changes in the depolarization effects were often observed. Possible explanations of the change in the state of polarization of a radio wave reflected by auroral ionization are discussed. Author