A note on persisting radio propagation effects after high altitude nuclear bursts

In 1958 the United States detonated two megaton-range nuclear devices, one (Teak) at 252,000 feet and the other (Orange) at 141,000 feet over the vicinity of Johnston Island [U.S. Government Printing Office, 1962]. For several days after each burst anomalous propagation effects were observed in the general area. Samson [1960] has pointed out that radio noise data obtained in Hawaii showed that the LF and VLF regions were particularly affected. The greatest effect was a reduction in the nighttime noise intensity for several nights following the detonations.