The ROSCOE Manual. Volume 16. High-Altitude Neutral-Particle Motion.
Final rept. 1 Mar 74-31 Jan 75,
GENERAL RESEARCH CORP SANTA BARBARA CALIF
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Two preliminary, alternative models of the high-altitude h or 90 km neutral-particle motion have been adopted for use in ROSCOE. Both models are one-dimensional spherical Lagrangian models and describe the vertical hydrodynamic motion in each geocentric column in an array of perhaps 100 such continuous but independent columns covering the disturbed region of interest. The models SAIHYD, NRLHYD describe the motion of a set of either Lagrangian cells or points by using the method of either difference equations or differential quadrature, respectively. Both models have automatic rezone capability. The geocentric columns defining the geometry for the calculations are described in terms of an arbitrarily positioned and oriented quadrupole coordinate system. Each Lagrangian cell or point is characterized by not only the hydrodynamic properties but also a set of chemistry quantities. The chemistry is loosely coupled to the hydrodynamics. Herein are presented details of the quadrupole coordinate system, the working form of the hydrodynamic equations and their initialization and methods for solution, the results of a test problem for a large-yield event at 200-km altitude producing motion in a linear array of six columns. Author
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