The thermosphere is the region above the mesosphere and exhibits the strongest height variation of temperature of all atmospheric layers, from the absolute minimum at the mesopause to the absolute maximum, the exospheric temperature. It is also the region where the most drastic changes in atmospheric composition occur and where the atmosphere becomes partly ionized and acquires the properties of a magneto-plasma. The solar EUV radiation is absorbed in the thermosphere and here we localize most of the electric current systems which are responsible for the so-called variations of the geomagnetic field.
KeywordsConvection Argon Recombination Helium Flare
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