The thermosphère is the layer of Terrestrial atmosphere which is located above the Ionosphère. It starts with the altitude of 90-100 km.
It constitutes with the Exosphère, the hétérosphère where the composition of the air is not uniform any more. The mixing of the air is not sufficient any more to maintain the distribution of mixture as in the sub-bases. The limit with the exosphère depends on the Solar activity.
Between 100 and 150 kilometers of altitude, the molecular dioxygene absorbs the Ultraviolet solar of very short wavelengths (between 100 and 200 Nm). In an increase results from Température with the altitude which oscillates between 300 °C and 1600°C according to the solar activity. The temperatures are high, but the Densité of Matière is extremely weak.
The Molécule S of dioxygene (O2) are dislocated then into two Atome S of oxygen (O), which explains why atomic oxygen becomes the constituent main thing of the thermosphère.
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