Abstract
WE are grateful to Mr. Jones for outlining his suggestion as to a possible method for the formation of the low-level atmospheric ducts in Cardigan Bay which we postulate from our radio field-strength measurements. According to current radio-meteorological theory, ducts should not occur during turbulent conditions. It surprised us, therefore, to find from the radio measurements that in the winter high field-strengths, which suggest to us the presence of low-level ducts, could occur even during windy weather. Mr. Jones's hypothesis gives a very satisfactory quantitative explanation of a method by which ducts might be formed during such periods of high wind velocity. High field-strengths during winter, however, appeared to depend more on the fact that the temperature of the air was appreciably lower than that of the sea, rather than on the presence or absence of wind. The main difference between windy and still conditions was not in the amplitude of the received signal but in its stability, remarkably little fading ever being found during windy periods.
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MCPETRIE, J., STARNECKI, B. Low-Level Atmospheric Ducts. Nature 163, 639 (1949). https://doi.org/10.1038/163639b0
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DOI: https://doi.org/10.1038/163639b0
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