Accession Number : AD0758430

Title :   Early Time Air Fireball Model for a Near-Surface Burst.

Descriptive Note : Topical rept.,

Corporate Author : SCIENCE APPLICATIONS INC LA JOLLA CA

Personal Author(s) : Pomraning, Gerald C.

Report Date : MAR 1973

Pagination or Media Count : 31

Abstract : 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. (Author Modified Abstract)

Descriptors :   *NUCLEAR EXPLOSIONS, MATHEMATICAL MODELS, DIFFUSION, BURNING RATE, THERMAL RADIATION, ENERGY, NUMERICAL ANALYSIS, SURFACE BURST.

Subject Categories : Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE