Comparisons between various semi-empirical thermospheric models of the terrestrial atmosphere

Physics – Geophysics

Scientific paper

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Atmospheric Models, Geomagnetism, Solar Activity Effects, Thermosphere, Accelerometers, Annual Variations, Atmospheric Composition, Diurnal Variations, Geophysics, Helium, Oxygen Atoms, Particle Size Distribution, Satellite Drag, Temperature Distribution

Scientific paper

The availability of various global thermospheric models allows intercomparisons to be made for identical geophysical conditions. Solar activity effect, geomagnetic effect, diurnal variation, annual variation and latitudinal-seasonal dependence are analyzed in four semi-empirical models, viz. DTM, MSIS, ESRO 4 and J77. Emphasis is given to the discrepancies between the models, and some direct comparisons are made with satellite drag data and micro-accelerometer results. None of the semi-empirical models can represent correctly all geophysical aspects of the terrestrial thermosphere.

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