Abstract
THE apparent decrease, after opposition, in the rate of receipt of decametric radiation from the planet Jupiter has been attributed to the eclipse of Jupiter by the Earth's magnetosphere1. Dulk (private communication) noticed this effect when drawing histograms separately for the period before and after opposition for the apparitions in 1964 and 1965 and suggested that it might be due to the influence of the maximum usable frequency of the Earth's ionosphere on the reception of Jupiter's decametric radiation. But Gruber2 showed that the Earth's ionosphere cannot significantly influence the probability of receiving Jupiter's decametric radiation over an apparition. He attempted to determine the possible influence of Jupiter's magnetospheric tail and explained the observed effects by assuming two different sources.
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