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Home The thermosphere is where the Sun and Earth’s atmosphere first interact. (NASA) The thermosphere is where the Sun and Earth's atmosphere first interact. (NASA)

The thermosphere is where the Sun and Earth’s atmosphere first interact. (NASA)

The thermosphere is where the Sun and Earth's atmosphere first interact. (NASA)

The thermosphere is where the Sun and Earth’s atmosphere first interact. (NASA)

The Sounding of the Atmosphere using Broadband Emission Radiometry, or SABER, instrument on the Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics, or TIMED, satellite looks at the interaction between the Sun and Earth’s upper atmosphere. (NASA/JHU/APL)
The Thermosphere Climate Index calculates how much heat energy carbon dioxide and nitric oxide molecules in the thermosphere are radiating into space (and to the lower atmosphere). Based on that calculation, the TCI assigns a temperature rating — Hot, Warm, Neutral, Cool or Cold. (NASA/Linda Hunt)