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Title: An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification

Abstract

From FY 1986 through FY 1988, we monitored extremely low-frequency (ELF) electromagnetic (EM) fields to determine whether these signals could be detected from underground nuclear explosions. Signals clearly related to underground tests were detected only when the ELF field sensors were located within 10 km of surface ground zero. Theoretical analysis, based on the results of these measurements, shows that the ELF impulse signals from underground nuclear tests are of longer duration than those from lightning sources and are, therefore, less efficient in exciting resonances in the earth-ionosphere cavity, even though the source strength for each may be the same. Thus, ELF signals from underground nuclear tests with yields of <150 kT are generally lower than the background signals caused by worldwide lightning activity. Our conclusion is that ELF monitoring probably will not be useful for detecting underground nuclear tests at distances >10 km from the tests. 16 refs., 24 figs., 3 tabs.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6294530
Report Number(s):
UCRL-53899
ON: DE89010560
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Paper copy only, copy does not permit microfiche production
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; LONG WAVE RADIATION; MONITORING; TREATIES; VERIFICATION; UNDERGROUND EXPLOSIONS; ELECTROMAGNETIC FIELDS; ELECTRIC DIPOLES; FIELD TESTS; IONOSPHERE; MAGNETIC DIPOLES; NUCLEAR EXPLOSIONS; S CODES; COMPUTER CODES; DIPOLES; EARTH ATMOSPHERE; ELECTROMAGNETIC RADIATION; EXPLOSIONS; MULTIPOLES; PLANETARY IONOSPHERES; RADIATIONS; RADIOWAVE RADIATION; TESTING; 450300* - Military Technology, Weaponry, & National Defense- Nuclear Explosion Detection; 645202 - High Energy Physics- Particle Interactions & Properties-Theoretical- Electromagnetic Interactions & Properties

Citation Formats

Sweeney, J J. An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification. United States: N. p., 1989. Web. doi:10.2172/6294530.
Sweeney, J J. An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification. United States. https://doi.org/10.2172/6294530
Sweeney, J J. 1989. "An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification". United States. https://doi.org/10.2172/6294530. https://www.osti.gov/servlets/purl/6294530.
@article{osti_6294530,
title = {An investigation of the usefulness of extremely low-frequency electromagnetic measurements for treaty verification},
author = {Sweeney, J J},
abstractNote = {From FY 1986 through FY 1988, we monitored extremely low-frequency (ELF) electromagnetic (EM) fields to determine whether these signals could be detected from underground nuclear explosions. Signals clearly related to underground tests were detected only when the ELF field sensors were located within 10 km of surface ground zero. Theoretical analysis, based on the results of these measurements, shows that the ELF impulse signals from underground nuclear tests are of longer duration than those from lightning sources and are, therefore, less efficient in exciting resonances in the earth-ionosphere cavity, even though the source strength for each may be the same. Thus, ELF signals from underground nuclear tests with yields of <150 kT are generally lower than the background signals caused by worldwide lightning activity. Our conclusion is that ELF monitoring probably will not be useful for detecting underground nuclear tests at distances >10 km from the tests. 16 refs., 24 figs., 3 tabs.},
doi = {10.2172/6294530},
url = {https://www.osti.gov/biblio/6294530}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}