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- W2069634100 abstract "In two previous papers (which will be referred to as I and II) Best, Ratcliffe and Wilkes (1936), and Budden, Ratcliffe and Wilkes (1939) have given an account of some experiments on the nature of the downcoming wave received at Cambridge from the British Post Office transmitter at Rugby (GBR wave-length 18.8 km.; distance 90 km.). Data are there given concerning the polarization of the wave, and the height of reflexion and the daily and seasonal changes of these quantities. Reflexion of very long waves takes place low down in the ionosphere where the density of ionization is only a few hundred electrons per c.c. The purpose of this paper is to discuss the theoretical implications of the data given in I and II, and to make such deductions as are possible from them concerning physical conditions in the lowest part of the ionosphere. In § 2 the changes in reflexion height at sunset, and in following sections the polarization and amplitude of the reflected wave will be discussed. Use will be made of Chapman’s well-known theory of the production of ions in a rotating atmosphere illuminated by ultra-violet light from the sun (Chapman 1931). It will be assumed that electrons tend to disappear sufficiently rapidly for the ionization to be always in quasi-equilibrium with changes in the rate of production of ions. It has been possible to interpret short-wave absorption and critical frequency results on this basis (Appleton 1937; Best, Farmer and Ratcliffe 1938) and we are consequently encouraged to try it for long waves. Finally, in § 7 the relation of this paper to previous theoretical work on the reflexion of very long waves will be discussed." @default.
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- W2069634100 date "1940-04-10" @default.
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- W2069634100 title "The theory of reflexion of very long wireless waves from the ionosphere" @default.
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- W2069634100 doi "https://doi.org/10.1098/rspa.1940.0050" @default.
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