Abstract
The analysis of ionospheric data taken from 54 ionosonde observatories throughout the world indicates the presence of several traveling ionospheric disturbances originating from the five high-altitude nuclear tests conducted over Johnston Island in 1962. These disturbances were propagated over large distances and were observed as changes in the F2-layer critical frequency. They are interpreted as a series of waves that are propagated at various velocities. Travel time curves are presented indicating dispersion and a range of velocities from 50–900 m/sec.
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