As participant in DOE/ISA*s Ionospheric Monitoring Program, LLNL his the responsibility of providing theoretical understanding and calculational support for experimental activities carried out by Los Alamos National Laboratory in using ionospheric sounders to remotely detect violent atmospheric phenomen :. We have developed a system of interconnected computer codes which simulate he entire range of atmospheric and ionospheric processes involved in this remote detection procedure, we are able to model the acoustic pulse shape from an atmospheric explosion, the subsequent nonlinear transport of this energy to all parts of the immediate atmosphere including the ionosphere, and the propagation of high-frequency radio waves through the acoustically perturbed ionosphere. Our calculational methods are derived from acoustic and radio ray tracing procedures which are based on geometric optics, and from finite amplitude acoustic wave propagation theories which take convection and dissipation into account. 2 3 4 Los Alamos' coverage of ONA's MILL RACE event ' • provided us with an excellent opportunity to assess the credibility of our calculational system to correctly predict how ionospheric sounders would respond to a surface-bas^d chemical explosion. In this experiment, 600 tons of high explosive were V
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