Effects of July 1962 nuclear explosion on time‐signal transmissions
B. R. Gibson · New Zealand Journal of Geology and Geophysics · 1962
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.