Download or read book Mars Global Reference Atmospheric Model (Mars-Gram) Version 3.8 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mars Global Reference Atmospheric Model (Mars-GRAM) Version 3.8 is presented and its new features are discussed. Mars-GRAM uses new values of planetary reference ellipsoid radii, gravity term, and rotation rate (consistent with current JPL values) and includes centrifugal effects on gravity. The model now uses NASA Ames Global Circulation Model low resolution topography. Curvature corrections are applied to winds and limits based on speed of sound are applied. Altitude of the F1 ionization peak and density scale height, including effects of change of molecular weight with altitude are computed. A check is performed to disallow temperatures below CO2 sublimination. This memorandum includes instructions on obtaining Mars-GRAM source code and data files and running the program. Sample input and output are provided. An example of incorporating Mars-GRAM as an atmospheric subroutine in a trajectory code is also given.Justus, C. G. and James, B. F.Marshall Space Flight CenterMARS (PLANET); MARS ATMOSPHERE; ATMOSPHERIC TEMPERATURE; ATMOSPHERIC MODELS; ATMOSPHERIC DENSITY; SUBROUTINES; USER MANUALS (COMPUTER PROGRAMS); COMPUTER AIDED TOMOGRAPHY; TOPOGRAPHY