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Polarization characteristics of VHF radio waves reflected by the E s-layer

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2 Author(s)
Ichinose, M. ; Commun. Res. Lab., Minist. of Posts & Telecommun., Tokyo, Japan ; Kainuma, S.

Interference in VHF-TVs caused by the radio waves reflected from the ionosphere is a very serious problem in the area around Japan. The polarization rotation of the waves reflected by an Es-layer are clarified by the measurement of a VHF television signal. Two types of polarization rotation are observed. In one case, the more common of the two, the polarization rotation varies randomly in a narrow range around an angle which rotate from the transmitted horizontal polarization in a short fading period. In the other case, which has a long fading period, the polarization rotation varies slowly in a wide range. It is shown that these polarization characteristics are caused by the Faraday effect in the ionosphere below the Es-layer and in the Es-layer itself

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Broadcasting, IEEE Transactions on  (Volume:42 ,  Issue: 2 )