Cover: Economical Methods for Calculating LF and VLF Ionospheric Attenuation Based on Wave Theory.

Economical Methods for Calculating LF and VLF Ionospheric Attenuation Based on Wave Theory.

Published 1967

by Cullen M. Crain, Henry G. Booker

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A companion Memorandum to RM-5249-PR, "LF and VLF Reflection Loss in the Lower Ionosphere: A Theorem on Absorption and Its Application," demonstrating the usefulness of its methods. An analysis is made of a National Bureau of Standards publication in which L. A. Berry compared different methods of calculating the transmission loss caused by nuclear detonation, including the 1964 Crain and Booker method (RM-4031). The cases used in Berry's comparison were recalculated by the improved Booker-Crain method of RM-5249, in which an empirical constant was refined, and an alternative procedure from the same Memorandum was used to check the results. For profiles usually encountered in a nuclear environment the methods are reliable and economical, but care should be taken in applying them to profiles that are not basically exponential in character. 25 pp. Refs.

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