Abstract
Abstract The high-altitude nuclear explosion over Johnston Island on 9 July 1962 did not affect the reception at Wellington of the time-signal transmissions from GBR (Rugby), WWV (Washington), WWVH (Hawaii), and JJY (Japan) as much as was expected. The 16 kc/s transmission from GBR suffered a drop of only 3 dB for about 40 minutes after the explosion; WWVH and JJY were completely blacked out for about 44 minutes; and WWV was affected for a similar period, the 15 Mc/s signal being blacked out, the 10 Mc/s almost blacked out, and the 5 Mc/s only moderately affected. The estimated time of detonation is July 9d 09h OOm 09s· 016 UT.
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