References

CD-ROM Publication of the Mars Digital Cartographic Data Base, NTIS HC MF A25. Bourke, R. D., editor (1991). Report of the Mars Atmosphere Knowledge Requirements Working Group, JPL Technology Report. Justus, C. G. (1990). A Mars Global Reference Atmospheric Model (Mars-GRAM) for Mission Planning and Analysis, AIAA 90-004, presented at the 28th Aerospace Sciences Meeting, Reno, NV, January. Justus, C. G. (1991). Mars Global Reference Atmospheric Model for Mission...

Wave Perturbation Magnitudes In Marsgram

Wave-like perturbations have been observed in the Viking 1 and Viking 2 surface pressure data (Leovy, 1981), in the Mariner 9IR spectroscopy data (Pirraglia and Conrath, 1974 Conrath, 1976, 1981), and the Viking 1 and Viking 2 lander entry profiles (Seiff and Kirk, 1976, 1977). Most of the wave-like perturbations have been interpreted as atmospheric tides (Pirraglia and Conrath, 1974 Conrath, 1976 Seiff, 1982), or as planetary waves (Conrath, 1981 Barnes and Hollingsworth, 1988). The theory of...

Introduction And Background

A highly successful and well-utilized engineering model for the Earth's atmosphere, the Global Reference Atmospheric Model (GRAM), was developed at Georgia Tech (Justus, et al., 1975, 1976), and has undergone several improvement cycles (Justus and Roper 1987 Justus, 1988). GRAM applications include orbital mechanics and lifetime studies, vehicle design and performance criteria, attitude control analysis problems, analysis of effects of short-term density variation from geomagnetic storms, and...

Bibliography

Bougher, S.W., et al. (1988) Mars Thermospheric General Circulation Model Calculations for the Arrival of Phobos at Mars. Geophys. Res. Let., 15(13). Clancy, R.T., D.O Muhleman and G.L. Berge (1990) Global Changes in the 0-70 km Thermal Structure of the Mars Atmosphere Derived from 1975 to 1989 Microwave CO Spectra. J. Geophys. Res., 95(B9). Davies, D.W. (1979) Effects of Dust on the Heating of Mars' Surface and Atmosphere. J. Geophys. Res., 84(B14). James, Bonnie F. and C. G. Justus (1993) The...

The Mars Global Reference Atmospheric Model Marsgram

Mars-GRAM, is based on parameterizations to approximate, as realistically as possible, the tmeperature, pressure, density and winds of the Martian atmosphere, and their latitudinal, longitudinal, diurnal, seasonal and altitude variation, from the surface through thermospheric altitudes. Parameterizations are also included for the effects of global-scale dust storms on the variations of the thermodynamic and wind properties of the Martian atmosphere. Recently, David Kaplan, compiler of the...

Setu Setu

Input a legal model number less than 1 or greater than 3. Reran program. 292 Format (1 Error in. starting random number.') SETTJ248 To indicate a random number seed value of less than 1 or greater than 29999 was input via NAMELIST INPUT file. Input a random number seed value greater than 0 and less than 30000. Rerun program. 381 Format(' x-code or y-oode input error.1) SETU296 To indicate a value of x-code outside the range 1 to 8, or y-code outside range 0 to 8 was input via NAMELIST INPUT...

Plans For Future Improvements In Marsgram

Although the goal of producing a fairly realistic model of the Martian atmosphere has been realized in the current version of Mars-GRAM, there is still room for substantial improvement and enhancement of the program. There is a considerable volume of computerized data, from the Mariner and Viking programs, available at government and university planetary studies laboratories around the country. As discussed in the previous section, since the current Mars-GRAM parameterizations were developed...

Marsgram Profiles Of Mean Temperature Pressure And Density

Parameterization for the representation of surface temperature and vertical temperature profiles, based on summaries from observational and model data, are discussed in the previous section. The addition of a parameterization for the variations in surface pressure, also discussed in the previous section, then allows for computation of vertical profiles of pressure and density by use of the hydrostatic and perfect gas law relations. Temperature profiles are built up from parameterizations of the...

PI

Computes amplitudes of cos Ls and cos 2 Ls terms as a function of the square of the latitude by Computes Ls phase angles of cos Ls and cos 2 Ls terms by phil phi11 phil2 Lat2 PRSE 12 phi2 phi21 phi22 Lat2 PRSE 13 Compute the relative pressure, as a function of latitude and Ls Lsun by- PR 1. al cos pil80 Lsun - phil PRSE 14 amp a2 cos 2. pil80 Lsun - phi2 PRSE 15 Description Computes the daily average surface pressure and local surface pressure at a given latitude and longitude for a given...