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Title:
OPERATION CASTLE, PROJECT 7.1, ELECTROMAGNETIC RADIATION CALIBRATION, PACIFIC PROVING GROUNDS, MARCH - MAY 1954 (DELETED)
Author(s):
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 Jun 13
Declassification Status:
Sanitized
Document Pages:
0040
Accession Number:
NV0051381
Document Number(s):
WT930EX
OpenNet Entry Date:
1994 Aug 26
Description/Abstract:
A TOTAL OF 17 STATIONS, ONE CLOSE-IN ( 320 KM FROM BIKINI AND 23 KM FR OM ENIWETOK ) AND THE BALANCE AT DISTANCE, WERE OPERATED FOR THE AFOAT -1 ELECTROMAGNETIC EXPERIMENTAL EFFORT, SEVENTY-FOUR SETS OF DATA WERE OBTAINED FROM A POSSIBLE TOTAL OF 102. OF THE REMAINING 28 SETS, NO D ATA WERE OBTAINED BECAUSE EQUIPMENT WAS NOT IN OPERATION, RECORDS WERE NOT READABLE, THE ALERT NOTIFICATIONS WERE NOT RECEIVED SIGNALS WERE NOT DISCERNIBLE, OR EQUIPMENT MALFUNCTIONED. BROAD-BAND ( CLOSE-IN, UP TO 40 MC; AT DISTANCES, ABOUT 100 KC ) AND NARROW-BAND ( ABOUT 200 CY CLES ) MEASUREMENTS WERE MADE OF THE VERTICAL FIELD COMPONENT. CLOSE-I N WAVEFORMS AND FIELD STRENGHTS WERE RECORDED FOR ALL SHOTS EXCEPT THE FIRST. SIGNALS WERE RECEIVED AND WAVEFORMS FIELD STRENGHTS AND AZIMUTH S WERE RECORDED AT DISTANCES EXCEEDING 12,000 KM FOR BOTH A NORTH-SOUT H AND AN EAST-WEST PATH. SPECTRUM ANALYSES OF THE FREQUENCY CONTENT OF THE CLOSE-IN WAVEFORMS CONFIRM THE THEORETICAL CONCLUSION THAT THE PR EDOMINANT FREQUENCY BECOMES LOWER AS THE YIELD INCREASES. FOR A NUCLEA R WEAPON IN THE 10MT RANGE, THE PREDOMINANT FREQUENCY IS ABOUT 8 TO 10 KC, WHILE IN THE 100-KT RANGE IT IS ABOUT 18 TO 20 KC. ANALYSES OF B ROAD-BAND PULSES RECEIVED AT DISTANCES SHOW THAT THE HIGHER FREQUENCIE S ARE ATTENUATED RELATIVELY MORE AND, WHEN RECEIVED AT SEVERAL THOUSAN D KILOMETERS, THE CLOSE-IN DIFFERENCES LARGELY DISAPPEAR. AN APPROXIMA TION OF YIELD MAY BE OBTAINED AT DISTANCES BY MEASUREMENT OF PEAK FIEL D STRENGHTS. WHERE EQUIPMENT CAPABILITIES PERMITTED, TIMES OF DETONATI ON-- AFTER ALLOWING FOR TRAVEL TIME OF THE NUCLEAR DETONATION SIGNALS AND STANDARD TIME SIGNALS--WERE MEASURED TO WITHIN 2 MSEC, WITH ONE EX CEPTION. TRANSMITTING STATIONS IN THE VERY LOW FREQUENCY BAND WERE MON ITORED AT SELECTED INTERVALS. GENERALLY, A NORTH-SOUTH PATH CROSSING T HE AURORAL ZONE SHOWS GREATER ATTENUATION THAN AN EAST-WEST PATH OF EQ UIVALENT DISTANCE.


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