BURIED MAGNETIC FIELD MEASUREMENT FOR DETERMINING THE SIZE OF UNDERGROUND NUCLEAR EXPLOSIONS

THE GOAL OF THIS PROGRAM IS TO DETERMINE THE HYDRODYNAMIC YIELD OF UNDERGROUND TESTS USING ELECTROMAGNETIC MEANS. IN PHASE I, WE WILL STUDY AND REVIEW THE SOURCES OF ELECTROMAGNETIC EMANATIONS FROM THE DEVICE AND THE ASSOCIATED CABLING. WE WILL ALSO ANALYZE THE PROPAGATION AND INTERFERENCE EFFECTS FOR THE RECORDING OF THE SIGNALS. WE HOPE TO ESTABLISH THE FEASIBILITY OF MEASURING YIELD FROM LOW-FREQUENCY MEASUREMENTS OF THE MAGNETIC BUBBLE'S DISTORTION OF THE GEOMAGNETIC FIELD. THIS WOULD BE MEASURED AT VARIOUS DEPTHS AND RANGES COMMENSURATE WITH THE STRENGTH OF SIGNAL AND SURVIVABILITY OF THE EQUIPMENT. THESE MEASUREMENTS ARE NOT AS SENSITIVE AS SURFACE MEASUREMENTS OF B AND GENERAL MEASUREMENTS OF E TO INTERFERENCE EFFECTS AND GROUND VARIATION EFFECTS. WE WILL LOCATE AND USE THE EXISTING DATA OF EM MEASUREMENTS OF TESTS TO VALIDATE THE MODELS WE PROPOSE FROM MAGNETIC BUBBLE AND INTERFERENCE EFFECT. THIS BURIED QUASI-STATIC MAGNETIC FIELD MEASUREMENT WOULD PROVIDE AN EFFECT ADJUNCT TO THE CORRTEX/SEISMIC TECHNIQUES NOW APPLICABLE UNDER THE TEST TREATY. IT IS AN INDEPENDENT MEASUREMENT OF A PHYSICAL PHENOMENA WHICH IS RELATED TO HYDRODYNAMIC YIELD.