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The correlation between the reception in the evening of v.h.f. signals on Japan Australia circuits and the presence of spread F along the circuits is examined. The correlation is found to be highly significant and leads to the conclusion that spread F is a necessary but not sufficient condition for such reception. The fact that the presence of spread F is not a sufficient condition is explained in terms of either breaks in its distribution along the circuits or of plasma frequencies which are too low to support the proposed propagation mode.

Evening?Type Transequatorial Propagation on Japan?Australia Circuits