Alternate Definitions for Thermosphere

The layer of the atmosphere that extends fromthe Mesosphere to 640+ km, temperature increasing with height.

The region of the upper atmosphere in which temperature increases continuously with height, starting at roughly 100 km. The thermosphere includes the exosphere and most of the ionosphere.

An upper part of Earth's Atmosphere that includes the Ionosphere and extends from an altitude of 85 km (above the mesopause), where the temperature is about -33 °C, to the lower level of the Exosphere at 500 km, where the temperature is about 1,500 °C