The effect of scintillations on the polarization of satellite transmissions near 20 Mc/s

Physics

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Scientific paper

Some of the differences between the scintillation of radio stars and that of satellite transmissions are outlined. One of these is due to the polarized nature of satellite transmissions. Two manifestations of the effects of small ionospheric irregularities on the linear polarization of 20 Mc/s transmissions are described; first, the disappearance of the regular Faraday fading nulls, and secondly, the lack of correlation of scintillation fluctuations observed on crossed polarized receiving aerials. Two mechanisms by which the scintillation affects the polarization are suggested. The more probable of these is one in which the ordinary and extraordinary components of the ray path are separated at the height of the irregularities by an amount sufficient to cause the two rays to scintillate independently. Expressions are developed which give an estimate of the separation to be expected from the differential refraction of the two component rays. Results of ray tracing computations of the separation by Haselgrove are quoted. The implications of effects described on the studies of the scintillations of radio stars and of satellite transmissions are discussed.

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