Asri-unix.1012 net.space utzoo!decvax!ucbvax!ARPAVAX:C70:sri-unix!CSD.SPENCER@SU-SCORE Sun Mar 14 23:06:49 1982 Re: SPACE Digest V2 #131 Some random comments. There is no relevent ground zero for a blast this high. There was a nuclear weapon detonated in the upper atmosphere in the past. (Late '60s maybe ?) Models of the ionosphere still take explict account of the effects of this weapon. -Tom -------