Based on the vertical temperature profile in the atmosphere, the thermosphere is the highest layer, located above the mesosphere. While in the troposphere and the mesosphere, the temperature decreases with altitude. In the stratosphere and thermosphere...

That layer of the earth’s atmosphere extending between the MESOSPHERE and the EXOSPHERE. It extends to a height of around 400 km from the earth’s surface at which height temperatures can reach 1,000°C. See also:...

The thermosphere is the layer of the earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation causes ionization. (see also: ionosphere). It is the fourth atmospheric layer from earth....