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In the fall of 1962 nuclcar de\' ices explod ed ncar J ohn ston I sland on OctobC'J" 20 and 26 , and Novem be r 1 . produced phase per turba t ions of very-Iow-frcqucncy rad io waves Ill oni iored at APL/,J H U. For t hc c vcnt of October 26, and in rcga rd to the VLF tran smission from NBA in Balboa , Panama, as r eceived at APL, lhe pertul'iJation has a temporal variat ion attributable to trapped i'J-rays from the rad ioactive decay of neut rons . The a rtificia l belt of i'Jrays forms a round t he geomagne tic m eri d ian th rough the burst point. As the sl ream rlrifts ea stward in ils first global circu it a n e ll ergy d ispersio n occurs because t he 1I1 0re energetic partic les also Ilave a la rger azimutha l d rif t veloc ity . The attenda n t perlurbal.lons a long VLF propagation paths remote from t he deto nation a rca ha ve a temporal va rIat ion 111 a~co rd WIth t hat of lhe c ne!'gy o f lhe lrappcd i'J -ray . s t ream passing over the VLF pa t h. lhe \I'ork on th lS event confirlTl S t he results of an ea rl ier s t ud y which co n ta in ed a n uncC'J"La inty due to Lhe prcscnce of a natu ra l d istu rba nce, a d isturbance which appa rently did no t especiall y affect t he region he rein treated . The VLF perturbations due to Lhe b ursts o f October 20 a nd Novemb('r 1 we re rela ti ve ly small but the former evc nt did produce a dis t urbance a lso cons istent wi t h the idca that the cause res id es in trapped i'Jra ys from l he deca y of nell tro ns . .

VLF disturbances caused by trapped beta-rays from decay of neutrons produced in high-altitude nuclear explosions