Mars thermospheric general circulation model: Calculations for the arrival of Phobos at Mars

The NCAR thermospheric general circulation model (TGCM) for the Earth's thermosphere has been modified to examine the three‐dimensional structure and circulation of the upper mesosphere and thermosphere of Mars (MTGCM). The computational framework and major processes unique to a CO2 thermosphere are similar to those utilized in a recent Venus TGCM. Mean orbital, seasonal, and solar conditions are specified. An Equinox version of the MTGCM is used to predict the Mars solar driven global circulation and structure for a non‐dusty (quiet) lower atmosphere at the time of arrival of the two Phobos spacecraft.