Disturbances in the lower ionosphere caused by a low altitude nuclear explosion

Details Disturbances in the lower ionosphere caused by a low altitude nuclear explosion Disturbances in the lower ionosphere caused by a low altitude nuclear explosion

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..237x&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 3, p. 237-243

Physics

Ionization, Ionospheric Disturbances, Radar Scattering, Scattering Cross Sections, Specular Reflection, Thermonuclear Explosions, Gamma Rays, Mathematical Models, Plasma Oscillations, Shock Waves

Scientific paper

Observations of the lower ionospheric disturbance caused by a low altitude nuclear explosion are presented. A forward scatter radar, frequency 41 MHz, power 2.5 kW, was used to study these disturbances. The first radar scattering signal consisting of three peaks appeared 40 s after the explosion. It was due to early ionization by delayed gamma rays. The second kind of disturbance generated after 190 s was clearly different from the first. The scattering signal had a constant component which indicated a strong specular reflection. The field strength increased by more than 20 db. This disturbance was produced by the direct shock wave. The third kind of disturbance began after 8 min, lasted 5.0 min, and was probably dominated by the fireball/smoke cloud oscillation when it reached its stabilization altitude and approached hydrodynamical equilibrium with the ambient atmosphere. Using numerical computation techniques, we have explained the above results well.

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