Abstract
Radio communications have never been noted for their consistency. At first this was attributed to atmospheric disturbances and to the low energy emitted, with reception by unreliable apparatus, but when the power radiated was greatly increased and modern appliances of great sensitivity and constancy were brought into daily use, it was still found that the intensity of the received signals from any station at long distances was variable at times, though it was seldom if ever that signals were entirely lost at the stations designed to receive them. When directional wireless was brought into use, it was found that, in addition to variable strength of signals, great variations were experienced at night in the bearings of the observed stations.
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JACKSON, H. The Electrical State of the Upper Atmosphere1. Nature 117, 454–455 (1926). https://doi.org/10.1038/117454b0
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DOI: https://doi.org/10.1038/117454b0