Document Details


Title:
OPERATION HARDTACK-PROJECT 8.2: THERMAL RADIATION FROM HIGH-ALTITUDE BURSTS (DELETED)
Author(s):
BRUBAKER, R M [AIR FORCE CAMBRIDGE RESEARCH LABORATORY]; GAUVIN, H P [AIR FORCE CAMBRIDGE RESEARCH LABORATORY]; STAIR, A T [AIR FORCE CAMBRIDGE RESEARCH LABORATORY]; CAHILL, J P [AIR FORCE CAMBRIDGE RESEARCH LABORATORY]; BAKER, D J [AIR FORCE CAMBRIDGE RESEARCH LABORATORY]; JONES, E A [COOK RESEARCH LABORATORIES, COOK ELECTRIC CO, CHICAGO, IL]; CARPENTER, J W
Subject Terms:
HARDTACK I OPERATION; THERMAL RADIATION; ATMOSPHERIC EXPLOSIONS; YUCCA EVENT; ORANGE EVENT; TEAK EVENT; MEASURING METHODS
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:
1961 Oct 06
Declassification Status:
Sanitized
Document Pages:
0069
Accession Number:
NV0051020
Document Number(s):
WT1648EX
Originating Research Org.:
AIR FORCE CAMBRIDGE RESEARCH LABORATORY
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
THE OBJECTIVE WAS TO IMPROVE THE BASIC UNDERSTANDING OF THE PHYSICS OF HIGH-ALTITUDE NUCLEAR DETONATIONS BY MEASURING THE THERMAL RADIATION FROM THE HIGH-ALTITUDE SHOTS YUCCA, ORANGE, AND TEAK. SPECTRAL IRRADI ANCES OBTAINED BY DISTANT AIRBORNE INSTRUMENTATION ARE PRESENTED AS A FUNCTION OF TIME IN FOUR WAVELENGTH BANDS: 0.3 MICRONS TO 0.4 MICRONS, 0.4 MICRONS TO 0.5 MICRONS, 0.5 MICRONS TO 1 MICRON, AND 0.3 MICRONS TO 3.6 MICRONS. THE MEASUREMENTS ARE EXTRAPOLATED TO AN ASSUMED POINT SOURCE, AND THESE GENERALIZED RESULTS ARE DISCUSSED. SHOT YUCCA, A BALLOONBORNE DEVICE DETONATED AT 84,680 FEET, RADIATED APPROXIMATELY LIKE A BLACK BODY; AND, AS EXPECTED, THE THERMAL PULSE HAD THE CHARACT ERISTIC SHAPE OF A SEA LEVEL BURST. TIME TO FIRST MAXIMUM WAS APPROXI MATELY TIME TO MINIMUM WAS , AND TIME TO SECOND MAXIMUM WAS . THE THERMAL PULSE WAS OF SHORTER DURATION THAN A SIMILAR LOW-ALTITUDE BURST ALTHOUGH THE TOTAL THERMAL ENERGY WAS ABOUT THE SAME--40 PERCEN T OF THE DEVICE YIELD. SHOT ORANGE, A DEVICE CARRIED TO 140,990 F EET BY A REDSTONE ROCKET, SHOWED MARKED DEVIATIONS FROM LOW-ALTITUDE B URSTS. TIME TO FIRST MAXIMUM WAS : THE MINIMUM, WHICH WAS EVID ENT ONLY IN THE 0.5 MICRONS TO 1 MICRON REGION, OCCURRED AT ABOUT : AND THE PRIMARY THERMAL PULSE WAS OVER IN . THERE WAS A SHIFT IN THE SPECTRAL DISTRIBUTION TOWARD THE INFRARED. IN THE O.3 MICRONS TO 1 MICRON REGION THE TOTAL THERMAL ENERGY WAS 20 PERCENT OF THE YIEL D WHEREAS AN EXTRAPOLATED FIGURE FOR THE 0.3 MICRONS TO 3.6 MICRONS RE GION WAS 45 PERCENT OF THE YIELD. SHOT TEAK, A DEVICE CARRIED TO 250,380 FEET BY A REDSTONE ROCKET, HAD ONLY ONE THERMAL MAXIMUM OCCURR ING AT . THE PULSE THEN DECAYED. THE POWER RADIATED AT MAXIMUM, EXTRAPOLATED TO A POINT SOURCE, HAD A SPECTRAL DISTRIBUTION AS FOLLOWS: 0.3 MICRONS TO 0.4 MICRONS, 0.4 MICRONS TO 0.5 MICRONS , 0.5 MICRONS TO 1 MICRON, AND 0.3 MICRONS TO 3.6 MICRONS, BY SUBTRACTION, AN UPPER BOUND OF WATTS RADIATED AT WAVELENGTHS GR EATER THAN 1 MICRON IS OBTAINED. THE PRONOUNCED SHIFT OF THE RADIATIO N TOWARD THE INFRARED IS APPARENT. SIMPLE SCALING LAWS ARE NOT SUFFIC IENT TO PREDICT THE THERMAL RADIATION FROM A HIGH-ALTITUDE NUCLEAR DET ONATION. IN PARTICULAR THE POWER RADIATED IN THE INFRARED EXCEEDS BY A LARGE FACTOR THAT EXPECTED FROM A BLACK BODY OF DIMENSIONS COMPARABL E WITH THE VISIBLE FIREBALL. THIS IMPLIES THE EXISTENCE OF SOME MECHA NISM THAT IS PRODUCING A GREATER PROPORTION OF INFRARED RADIATION THAN WOULD BE OBTAINED USING THE EQUILIBRIUM BLACK BODY THEORY.


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