Abstract

Abstract From measurements of the amplitude of the 54 Mc/s signals from the satellite Transit 4A, the total electron content of the ionosphere up to a height of 920 km is calculated. Thirty-five minutes after the high-altitude explosion the electron content over Auckland was twice the normal value of 4·2 × 1016 electrons per m2. South of Auckland, over Nelson, the electron content increased to about three times the normal value. The Faraday fading of the signals almost completely disappeared north of Auckland, and this effect cannot be explained by normal ionospheric absorption of the extraordinary component.

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