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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.
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2) [ILLUSTRATION OMITTED] Strictly speaking, NLC is not an 'astronomical' phenomenon, being in the mesopause at about 83km, but it is part of the solar-terrestrial environment and many aspects of it, including a possible connection with the aurora, are not fully understood.
Noctilucent cloud over Britain and Western Europe, 2001-2005 by Gavine, David / Journal of the British Astronomical Association
During summer, the mesopause region is the coldest part of the Earth's atmosphere, reaching a frosty minus 130[degrees]C.
Night shift. (spectrum) by Pyper, Wendy / Ecos
Moreover, the theories require that the mesopause be cold enough for condensation to occur.
Mysterious clouds caused by cosmoids? by Weisburd, Stefi / Science News
 
 
 
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