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Radiosonde data, for stations in the South Atlantic trade-wind belt are analyzed to determine the potentialities of the trade-wind inversion as an elevated duct for transoceanic radio transmission. These were supplemented by refractometer soundings made by an aircraft during the latter part of 1958. These records indicate that a duct is present in the majority of the cases. Since it is known that the radiosonde underestimates ducting because of its slow response, it is concluded that a duct is present practically all the time. On the basis of the data analyzed, an experiment with two aircraft is suggested to test the propagation potentialities of this mechanism. A frequency of around 200 megacycles per second appears to be a good choice for an initial experiment.
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The trade-wind inversion as a transoceanic duct
Katzin, M.; Pezzner, H.; Koo, B. Y.-C.; Larson, J. V.; Katzin, J.C.
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