Global Reference Atmospheric Model (GRAM) Suite Overview and Current Status

Hilary L. Justh

NASA NTRS · 20220005313

Global Reference Atmospheric Model (GRAM) Suite Overview and Current Status

Abstract

• Engineering-oriented atmospheric models that estimate mean values and statistical variations of atmospheric properties for numerous planetary destinations • Currently available for Earth, Mars, Venus, Titan, Neptune, Uranus, and Jupiter • Outputs include atmospheric density, temperature, pressure, chemical composition, radiative fluxes (for Mars-GRAM), and wind components along a user-defined path – Includes seasonal, diurnal, geographic, and altitude variations • Widely used by the engineering community because of their ability to create realistic atmospheric dispersions • Can be integrated into high fidelity flight dynamic simulations of launch, entry, descent and landing (EDL), aerobraking and aerocapture • Optional trajectory input file consisting of time, height, latitude, and longitude can be used to provide the GRAM trajectory path • Optional auxiliary profile consisting of height, latitude, longitude, temperature, pressure, density, eastward wind, and northward wind may be used to replace model data in the GRAMs • Not a forecast model

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atmospheric models GRAM Titan-GRAM Neptune-GRAM Mars-GRAM Venus-GRAM Jupiter-GRAM Earth-GRAM Uranus-GRAM GRAM Suite atmospheric temperature atmospheric density winds Global Reference Atmospheric Model

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Hilary L. Justh. Global Reference Atmospheric Model (GRAM) Suite Overview and Current Status. https://ntrs.nasa.gov/citations/20220005313

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