Abstract

Recent observations at King's College, London, concerning the determination of the propagation constant (attenuation and phase velocity) of electromagnetic waves over the earth's surface are described. The experimental techniques employed include the use of single‐station and two‐station magnetic recording of atmQspherics (sferics) propagated over great distances and the observation of the frequencies and Q factors of Schumann resonances. The experimental results are interpreted in terms of the waveguide mode theory of propagation by assuming various electron and heavy ion density profiles for the ionosphere. The present work agrees well with the observations of other workers made over a limited frequency range, and enables the propagation constant to be determined from 8 c/s to 16 kc/s.

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