Source: Bull. At. Sci. (United States) Publication Date: Dec 1980 p 24-29 Document Type: Journal Article Language: English Journal Announcement: EDB8109 Subfile: INS (US Atomindex input); TIC v 36:10. Coden: (Technical BASIA Information Center). Country of Origin: United States Abstract: The United States conducted 66 atmospheric nuclear weapons tests in the Marshall Islands. Twenty-two years later the authorities continue to disagree on when the islands will be safe for resettlement. This article discusses the events that have occurred in the past 30 years.; Major Descriptors: *ATMOSPHERIC EXPLOSIONS -- HEALTH HAZARDS; *HUMAN POPULATIONS -- RADIATION DOSES; *MARSHALL ISLANDS -~- NUCLEAR EXPLOSIONS ; *PUBLIC HEALTH -- RECOMMENDATIONS Descriptors: FALLOUT; PLUTONIUM 239; PLUTONIUM 240; SOILS Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; DOSES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; EXPLOSIONS; HAZARDS ; HEAVY NUCLEI; ISLANDS; ISOTOPES; MICRONESIA; NUCLEI; OCEANIA; PLUTONIUM ISOTOPES; POPULATIONS; RADIOISOTOPES; YEARS LIVING RADIOISOTOPES Subject Categories: Weaponry -- 450202* (-1989) -- Explosions & Explosives -- Nuclear -- 560161 -- Radionuclide Effects, Kinetics, & Toxicology -- Man INIS Subject Categories: E14* -- Nuclear Explosions 10/5/783 (Item 483 from file: 103) 00793163 ERA-06-031330; EDB-81-101428 Author(s): Daniels, F.B.; Harris, A.K.; Goldman, D.T. Title: Effects of atomic explosions on the ionosphere Corporate Source: Army Electronics Labs., Publication Date: Aug 1954 Report Number(s): AD-363391 Document Type: Report Language: English Journal Announcement: p 64 Fort Monmouth, NJ (USA) EDB8106 Availability: NTIS, PC A04/MF AOQl. Subfile: BRA (Energy Research Abstracts); NTS (NTIS). Country of Origin: United States Country of Publication: United States Abstract: During Operation Ivy an ionosphere recorder was operated at some distance from the test site. In addition, hf radio transmissions with paths nearly over the blast area were monitored. A new phenomenon was observed in connection with the larger shot. It consisted of a sustained rise in the virtual height of the F2 layer, lasting more than 3 hr, and a simultaneous depression from normal values of the F2 critical frequency. These effects, although only relatively local in extent, are likened to those normally observed over large portions of the earth during magnetic storms. A possible physical explanation is propounded, based upon the hypothesis that much of the vertically propagated infrasonic energy produced by an explosion of this size is converted into heat in the lower portion of the F2 region. Other effects on the ionosphere, observed during both shots, were similar to those recorded during earlier operations and corrobrated previous theory attributing them to local changes of ion density caused by the sonic wave acting on the ionized layers. No major disturbance to ionospheric communications was found. However, some attenuation of all radio waves passing through the D and E regions in the vicinity of the _ blast was observed, lasting only 15 min or thereabouts.; =r ur3 o Major Descriptors: *IONOSPHERE ~- BLAST EFFECTS; *IONOSPHERE -- TEMPERATURE ry cS EFFECTS; *NUCLEAR EXPLOSIONS -- SHOCK WAVES oc Descriptors: D REGION; E REGION; F REGION; ION DENSITY; IVY PROJECT; ur> RECORDING SYSTEMS Broader Terms: EARTH ATMOSPHERE; EXPLOSIONS; IONOSPHERE; NUCLEAR EXPLOSIONS ; PLANETARY IONOSPHERES