mesopause


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Related to mesopause: mesosphere, menopause, ionosphere, thermosphere, tropopause

mesopause

[′mez·ə‚pȯz;]
(meteorology)
The top of the mesosphere; corresponds to the level of minimum temperature at 50 to 60 miles (80 to 95 kilometers).

Mesopause

 

a transition layer of the atmosphere (at an altitude of about 80 km) between the mesosphere, where the temperature decreases with altitude, and the thermosphere, where the temperature increases with altitude. The mesopause is thus a level of minimum temperature. Noctilucent clouds are observed at this altitude.

mesopause

The upper boundary of the mesosphere, which divides the thermosphere from the mesosphere. The lowest temperatures in the atmosphere—approximately −490°F (−290°C)—are encountered at the mesopause, which lies at a height of 50 to 55 miles (80–90 km) above the sea level. See mesosphere.
References in periodicals archive ?
The increasing release of methane into the atmosphere from sources such as rice paddies, land-fills and cattle, increases the amount of water in the dry mesopause region.
The cosmoid idea may also explain why the polar mesopause gets so cold.
It is thought that increased solar activity may cause the temperature at the mesopause to rise because of stronger ultraviolet radiation.