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Title:
OPERATION IVY, PROJECT 7.6, DETECTION OF FIREBALL LIGHT AT DISTANCES ( NOVEMBER 1952 )
Author(s):
Subject Terms:
IVY OPERATION; FIREBALLS; KING EVENT; MIKE EVENT; CALCULATION METHODS; DIAGRAMS
Document Location:
Location - NNSA/NSO Nuclear Testing Archive Address - P.O. Box 98521 City - Las Vegas State - NV Zip - 89193-8521 Phone - (702)794-5106 Fax - (702)862-4240 Email - CIC@NV.DOE.GOV
Document Type:
REPORT
Publication Date:
1958 Aug 29
Declassification Status:
Declassified
Document Pages:
0021
Accession Number:
NV0051109
Document Number(s):
WT646
Originating Research Org.:
ARMED FORCES SPECIAL WEAPONS PROJECT
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
ATTEMPTS WERE MADE TO DETECT AT LON DISTANCES THE LIGHT EMITTED FROM T HE IVY DETONATIONS. TWO LOCATIONS, JOHNSTON ISLAND ( 3,100 KM ) AND KW AJALEIN ISLAND ( 620 KM ), WERE CHOSEN. AT KWAJALEIN, IN ADDITION TO A GROUND INSTALLATION, EQUIPMENT WAS ALSO MOUNTED IN A PLANE FLYING ABOV E THE CLOUD COVER. MEASUREMENTS WERE MADE WITH RED-AND-BLUE- SENSITIVE PHOTOCELLS. OUT OF A POSSIBLE TOTAL OF SIX RECORDS ONLY ONE POSITIVE DETECTION WAS MADE AND THIS WAS FROM THE EQUIPMENT IN THE PLANE ON THE OCCASION OF KING SHOT. THE REMAINING CASES ARE ACCOUNTED FOR AS FOLLOW S: THREE CASES WERE TIMING NOTIFICATION UNCERTAINTIES WHICH MAKE IT IM POSSIBLE TO STATE THAT THE EQUIPMENT WAS OPERATING AT DETONATION TIME; ONE CASE WHERE IT IS KNOWN THAT THE EQUIPMENT WAS STARTED AFTER THE D ETONATION; AND ONE CASE WHERE THE EQUIPMENT WAS OPERATING AT THE RIGHT TIME BUT THERE IS NO RECORD OF THE LIGHT SIGNAL. IT IS CONCLUDED THAT LIGHT FROM A NUCLEAR DETONATION CAN BE DETECTED TO A DISTANCE OF ABOU T 600 KM UNDER FAVORABLE CONDITIONS. ANY FURTHER WORK SHOULD EMPHASIZE A BASIC STUDY OF THE PHENOMENA INVOLVED IN THE TRANSMISSION OF LIGHT BEYOND THE HORIZON.


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