The boundary between the top of the mesosphere and the bottom of the thermosphere. Defined by the place where the temperature stops decreasing, and begins to increase, as you go up in the atmosphere.
The top of the mesopsphere. This corresponds to the level of minimum temperature at 70 to 80 km.
An extremely cold region of the earth's atmosphere (approximately -90°C) at an altitude of approximately 80 km, representing the boundary between the mesosphere and the overlying thermosphere.
Thin boundary layer found between the mesosphere and the thermosphere. It is usually found at an average altitude of 80 kilometers. Coldest temperatures in the atmosphere are found at the mesopause.
top of the mesosphere, situated at about 80-85 kilometers (50-53 miles). Russian translation prepared by Nina A. Zaitseva for the Arctic Climatology Project Arctic Meteorology and Climate Atlas.
The top of the mesosphere and the base of the thermosphere. The mesopause is usually located at heights of 85–95 km, and is the site of the coldest temperatures in the atmosphere. Temperatures as low as 100 K (− 173°C) have been measured at the mesopause by rockets. See atmospheric shell.