The Integrated Spacecraft Environments Model (ISEM) is a modeling tool used for the modeling of spacecraft induced molecular environments for orbital altitudes above approximately 100 km. The geometrical modeling portion of ISEM is used to construct a three-dimensional model of any spacecraft. ISEM then computes molecular densities, surface fluxes, number column densities, molecular ionization, and the molecular depositions on critical surfaces defined by the user. ISEM computations account for molecule scattering, surface reemission, surface shadowing, ambient atmosphere, and all spacecraft molecular sources.
Tim Gordon
Senior Scientist Applied Science Technologies P.O. Box 621134 Littleton, CO 80162 USA 303-973-7708 fax:303-973-7408