mesopause


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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 ?
On this night, close to the new moon, there is no moonlight illuminating the scene--clouds are detectable via reflection of downwelling hydroxyl nightglow emitting principally from a region near the mesopause.
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.
So the combination of decreasing temperatures and increasing water vapour in the mesopause region, increases the likelihood of cloud formation,' Burns says.
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.