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Mars Global Reference Atmospheric Model (Mars-GRAM 2005) Applications for Mars Science Laboratory Mission Site Selection ProcessesThe new Mars-GRAM auxiliary profile capability, using data from TES observations, mesoscale model output, or other sources, allows a potentially higher fidelity representation of the atmosphere, and a more accurate way of estimating inherent uncertainty in atmospheric density and winds. Figure 3 indicates that, with nominal value rpscale=1, Mars-GRAM perturbations would tend to overestimate observed or mesoscale-modeled variability. To better represent TES and mesoscale model density perturbations, rpscale values as low as about 0.4 could be used. Some trajectory model implementations of Mars-GRAM allow the user to dynamically change rpscale and rwscale values with altitude. Figure 4 shows that an mscale value of about 1.2 would better replicate wind standard deviations from MRAMS or MMM5 simulations at the Gale, Terby, or Melas sites. By adjusting the rpscale and rwscale values in Mars-GRAM based on figures such as Figure 3 and 4, we can provide more accurate end-to-end simulations for EDL at the candidate MSL landing sites.
Document ID
20090028811
Acquisition Source
Marshall Space Flight Center
Document Type
Presentation
Authors
Justh, H. L. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Justus, C. G. (Stanley Associates Huntsville, AL, United States)
Date Acquired
August 24, 2013
Publication Date
July 9, 2007
Subject Category
Space Sciences (General)
Report/Patent Number
MSFC-306
MSFC-340
Meeting Information
Meeting: 7th International Conference on Mars
Location: Pasadena, CA
Country: United States
Start Date: July 9, 2007
End Date: July 13, 2007
Sponsors: Lunar and Planetary Inst., NASA Headquarters, California Inst. of Tech.
Distribution Limits
Public
Copyright
Public Use Permitted.

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