Polarisation of atmospheric pulses due to successive reflections at the ionosphere

Physics

Scientific paper

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Scientific paper

Measurements of the polarisation of successive pulses in echo-type atmospherics have been made at frequencies of 8 kc/s and 12 kc/s. The results have shown that the first few sky waves are nearly plane polarised, but that as the order of reflection increases the polarisation becomes more and more elliptical. The theoretical problem of the propagation of v.l.f. radio waves between the Earth and the ionosphere has been examined with particular reference to the calculation of theoretical values of polarisation. By a comparison of the theoretical values with those obtained experimentally, the appropriate reflection coefficients are derived for the Earth-ionosphere propagation system. It is suggested that the polarisation pattern of night-time echo trains can be explained in terms of multiple reflections between the ground and an ionospheric layer having a high electron density gradient in the lower fringes of the E-region.

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