Effects of propagation on the high-frequency electromagnetic radiation from low-altitude nuclear explosions

A method is proposed for modeling the complex dielectric constant of an anisotropic hierarchically constructed nanocomposite with a periodic structure, based on the complex application of quantum mechanical calculations, an effective medium model, and equivalent equivalent circuits. The dielectric constant of the TiO2 - Al2O3 nanocomposite under the action of external high-frequency electromagnetic radiation has been investigated. The wavelength ranges at which resonance bursts are observed are determined. The possibility of controlling the maxima of difference losses and resonance absorption maxima by changing the geometric parameters of the nanocomposite is shown.

Download Full-text

On the nature of traveling ionospheric disturbances launched by low-altitude nuclear explosions

The Upper Atmosphere in Motion - Geophysical Monograph Series ◽

10.1029/gm018p0330 ◽

1974 ◽

pp. 330-344

Author(s):

C. O. Hines

Keyword(s):

Ionospheric Disturbances ◽

Traveling Ionospheric Disturbances ◽

Nuclear Explosions ◽

Low Altitude

Download Full-text

Seismic effects of the MILROW and CANNIKIN nuclear explosions

Bulletin of the Seismological Society of America ◽

10.1785/bssa0620061411 ◽

1972 ◽

Vol 62 (6) ◽

pp. 1411-1423 ◽

Cited By ~ 2

Author(s):

E. R. Engdahl

Keyword(s):

High Frequency ◽

Low Frequency ◽

Test Site ◽

High Gain ◽

High Yield ◽

Upper Crust ◽

Seismic Effects ◽

Underground Nuclear Explosions ◽

Low Level ◽

Nuclear Explosions

abstract Seismic effects of the underground nuclear explosions MILROW (October 1969, about 1 megaton) and CANNIKIN (November 1971, under 5 megatons) were monitored by a network of continuously recording, high-frequency, high-gain seismographs located on Amchitka and nearby islands. Each explosion was immediately followed by hundreds of small, discrete events (mB < 4), of similar focal mechanism and with a characteristic low-frequency signature, which were apparently related to the deterioration of the explosion cavity. This activity intensified, then terminated within minutes of a large, complex multiple event and concurrent formation of a surface subsided area that signaled complete collapse of the explosion cavity (MILROW, 37 hr; CANNIKIN, 38 hr). A number of small explosion-stimulated tectonic events, apparently unrelated to the collapse phenomenon, occurred intermittently for several weeks following each explosion—near the explosion cavity and up to 13 km southeast of CANNIKIN ground zero along the Island. These events were confined to the upper crust of the Island, had characteristic high-frequency signatures, and, near the Rifle Range Fault, had focal mechanisms which could be correlated with pre-existing faulting. The evidence points to a short-term interaction of the explosions with local ambient tectonic stresses. Because these stresses are of relatively low level on Amchitka, the observed seismic effects were significantly less extensive and smaller than similar effects reported from high-yield explosions at the Nevada Test Site. Continuous monitoring of the natural seismicity of the Amchitka region since 1969 has not revealed other evidence for an interaction between either MILROW or CANNIKIN and natural tectonic processes. The structural stability and apparent low level of stress in the upper crust of Amchitka suggest that the Island effectively is seismically decoupled from the active subduction zone below.

Download Full-text