Ionospheric effects of high-altitude nuclear explosions

Physics

Scientific paper

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Scientific paper

On 9 July 1962, the U.S.A. detonated a nuclear device at a height of 400 km over Johnston Island. Russians detonated two nuclear devices at high altitude in Central Asia on 22 and 28 October 1962. The effect of these three explosions on the ionosphere has been studied in this paper. Effect on the lower ionosphere is found to be an instantaneous variation in the electron density almost simultaneous with the explosions. This has caused pronounced disturbance in the long-wave field strength received at Delhi of Radio Tashkent on 164 kc/s. The effect on the upper ionosphere (F2-layer) is seen to be a sharp decrease in the fOF2 almost simultaneous with the explosion. Thus high altitude nuclear detonations, unlike low altitude ones, are seen to produce nearly simultaneous effect on the ionosphere. Probable causes for the observed effects have been discussed.

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