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- W2039843119 abstract "Abstract A full wave method has been used to calculate the reflection and conversion coefficients of several model ionospheres for radiowaves in the frequency range 15–70 kHz propagated in a number of azimuthal directions at angles of incidence ranging from 0–90°. Three types of ionospheric model have been considered: 1. (a) simple exponential variations of electron density with height and constant electron collision frequency, 2. (b) an exponential electron density distribution and a collision frequency which varies with height, and 3. (c) typical experimentally derived height variations of both electron density and collision frequency. Both the reflection and conversion coefficients vary with the angle of incidence in a complicated manner, the degree of complexity increasing with the complexity of the ionospheric model. For most of the models considered, a marked decrease occurs in the coefficients at some angle of incidence and the dependence of these minima on the electron density height profile, wave frequency, azimuth and electron collision frequency has been investigated. It appears from the limited experimental data available that the reflection and conversion coefficients can obey a modified form of Martyn's absorption theorem, the so-called ƒ cos i law, which has often been used to relate experimental observations on one propagation path to those on another. The calculated reflection and conversion coefficients do not obey the simple ƒ cos i law and it is suggested that a detailed experimental study of the variation of the reflection coefficient with frequency, angle of incidence and azimuth should be undertaken." @default.
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- W2039843119 date "1970-05-01" @default.
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- W2039843119 title "Full-wave studies of the ionospheric reflection coefficients of VLF and LF radio waves" @default.
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- W2039843119 doi "https://doi.org/10.1016/0021-9169(70)90025-5" @default.
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