It is the coldest layer of the atmosphere, with the temperature dropping to its lowest at the boundary between the mesosphere and thermosphere, called the mesopause. The temperature of the earth's atmosphere varies with altitude, with the hottest layer being the mesosphere, which lies between 50 and 85 kilometers above the surface At least, above 100 km altitude, it's over the kármán limite considered as the limit between space and atmosphere.
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The last atmospheric layer has an altitude greater than 80 kilometers and is called the thermosphere
Temperatures in this layer can be greater than 1200° c
These high temperatures are generated from the absorption of intense solar radiation by oxygen molecules (o 2). The temperatures begin to fall again to about −90°c at the mesopause, which is about 80 km in altitude The thermosphere is the uppermost layer of the atmosphere, and the temperatures again begin to rise here Because the air is dry, the temperatures can rise to over 100°c.
This range is due to the temperature differences between the tropics and poles The warm surface temperatures and turbulent mixing over the tropics help to push the troposphere's boundary upward (lutgens 19). To add more information to the temperature graph, one can plot atmospheric temperature as a function of both latitude and altitude Figures 2 and 3 show such plots, with latitude as the x coordinate and altitude as the y.
