Early Time Air Fireball Model for a Near-Surface Burst
SCIENCE APPLICATIONS INC LA JOLLA CA
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An integral part of the 1D-2D synthesis technique used to estimate the energy coupled into the ground from a near-surface burst is a simplified air fireball model. One o the main limitations of the model currently in use is the assumption that the device output is a square wave in time i.e., the device radiates at a constant rate for a finite period of time. Analytic modeling work in the coupling problem has indicated that the time dependence of the device output is an important parameter in determining the radiative energy coupled into the ground. The purpose of the report is to describe in some detail this reformulation of the air fireball model. As in the current model, this reformulation envisions the air burning out at a fixed temperature. That is, for air temperatures less than the burnout temperature, the air opacity is assumed very large, and for air temperatures grester than the burnout temperature the air opacity is assumed very small.
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