On Some Iterative Methods for Solving Elliptic Difference Equations. E-book. Formato PDF Herbert B. Keller   -  Forgotten Books, 2017  - 

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Ionospheric Propagation of Plane Waves: August 1953. E-book. Formato PDF Herbert B. Keller   -  Forgotten Books, 2017  - 

The propagation of plane waves in a stratified ionosphere is considered. It is shown that the construction of 'true' charac teristic waves depends upon the diagonalization of a matrix by a Loewy transformation. For a homogeneous ionosphere this construo tion can always be carried out explicitly. For the general case we obtain the wave solution in terms of characteristic waves which have the properties usually attributed to characteristic waves in magneto-ionic theory. In addition, the interaction between these waves is made clear by the introduction of continuous reflection and transition coefficients. Ordinary and extraordinary wave-re flection levels are shown to be points at which the elementary di Visors of a certain matrix become non-simple. Complicated expres Sions are obtained from which ionospheric reflection and transmis sion coefficients may be obtained explicitly.