MGS accelerometer data analysis with the LMD GCM

Angelats i Coll, M.; Forget, F.; Lopez-Valverde, M.A.; Read, P.L. and Lewis, S.R. (2003). MGS accelerometer data analysis with the LMD GCM. In: First international Workshop on Mars atmosphere modelling and observations, 13-15 Jan 2003, Granada, Spain.



Mars Global Surveyor aerobreaking phases, required to achieve its mapping orbit, have yielded vertical profiles of thermospheric densities, scale heights and temperatures covering a broad range of local times, seasons and spatial coordinates [Keating et al. 1998, 2001]. Phase I covered local times from 11 to 16 h (assuming 24 "martian hours” per martian day or sols), with a latitude coverage of approximately 40deg to 60deg N. Seasons observed during this phase were centered around winter solstice and altitudes of periapsis range from 115 to 135 km. The altitudes for Phase II were lower, with a minimum around 100 km and a maximum around 120. Martian spring was the season covered during this phase and the local time was between 15 and 16 h. The latitude
covered by Phase II, however, was more extense than that seen during Phase I, with a coverage from 60deg N to basically the South Pole.

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