
%0 Journal Article
%A Mcnamara, LF 
%T Evening?Type Transequatorial Propagation on Japan?Australia Circuits
%J Australian Journal of Physics
%D 1973/08/01
%V 26
%N 4
%P 521-545
%K 
%R https://doi.org/10.1071/PH730521
%U https://www.publish.csiro.au/paper/PH730521 
%X 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. 
