NASA/TM-210279, Justus*, C.G. and James, B.F., Mars Global Reference Atmospheric Model 2000 Version (Mars-GRAM 2000): Users Guide, George C. Marshall Space Flight Center Marshall Space Flight Center, AL 35812, National Aeronautics and Space Administration Washington, DC 20546-0001, Prepared by Environments Group, Engineering Systems Department, Engineering Directorate, *Computer Sci, May 2000, pp. 48, Format(s): PDF 2864k |
This report presents Mars Global Reference Atmospheric Model 2000 Version (Mars-GRAM 2000) and its new features. All parameterizations for temperature, pressure, density, and winds versus height, latitude, longitude, time of day, and L(sub s) have been replaced by input data tables from NASA Ames Mars General Circulation Model (MGCM) for the surface through 80-km altitude and the University of Arizona Mars Thermospheric General Circulation Model (MTGCM) for 80 to 170 km. A modified Stewart thermospheric model is still used for higher altitudes and for dependence on solar activity. "Climate factors" to tune for agreement with GCM data are no longer needed. Adjustment of exospheric temperature is still an option. Consistent with observations from Mars Global Surveyor, a new longitude-dependent wave model is included with user input to specify waves having 1 to 3 wavelengths around the planet. A simplified perturbation model has been substituted for the earlier one. An input switch allows users to select either East or West longitude positive. This memorandum includes instructions on obtaining Mars-GRAM source code and data files and for running the program. It also provides sample input and output and an example for incorporating Mars-GRAM as an atmospheric subroutine in a trajectory code
| Keywords: | mars global reference atmospheric model, mars-gram, atmospheric density, atmospheric temperature, atmospheric models, winds |
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| Subjects: | Astronautics: Spacecraft Design, Testing And Performance |
| ID Code: | 542 |
| Deposited On: | 24 July 2002 |