Investigation of molecular motions in supercooled liquids by Mossbauer scattering D C Champeney and F W D Woodhams Some Aspects of Diffraction Theory and their Application to the Ionosphere

TLDR: In this article, the Fourier approach is extended to deal with problems of ''random'' diffraction, for which purpose the use of auto-correlation functions is introduced and explained in physical terms.

Abstract: In Part I the `Fourier' approach to diffraction theory is outlined in such a way as to emphasize its physical significance. Particular attention is paid to diffraction phenomena of the Fresnel type, and to diffraction from screens which alter both the phase and the amplitude of the incident wave. The `Fourier' approach is extended to deal with problems of `random' diffraction, for which purpose the use of auto-correlation functions is introduced and explained in physical terms. In Part II measurements made on radio waves reflected from, or transmitted through, the ionosphere are discussed. The nature of the radio diffraction pattern observed at the ground is first summarized and deductions are then made about the ionosphere which has given rise to this diffraction. There are few references in the text, but the bibliography provides brief abstracts of the more important papers on the subject.