From Glossary of Meteorology
term edited 12 Dec 2014
The region of the atmosphere below the turbopause where mixing dominates over molecular diffusion and results in constant ratios of the various constituents of dry air. It is also referred to as the homosphere.
Doornbos, E., 2012: Vertical structure of the atmosphere. Thermospheric Density and Wind Determination from Satellite Dynamics, Springer Theses Series, Springer-Verlag, 25–27.