![]() ![]() ![]() The boundary between the thermosphere and the exosphere above it is called the thermopause. Temperatures in the upper thermosphere can range from about 500° C (932° F) to 2,000° C (3,632° F) or higher. The thermosphere is typically about 200° C (360° F) hotter in the daytime than at night, and roughly 500° C (900° F) hotter when the Sun is very active than at other times. Solar activity strongly influences temperature in the thermosphere. Temperatures climb sharply in the lower thermosphere (below 200 to 300 km altitude), then level off and hold fairly steady with increasing altitude above that height. It extends from about 90 km (56 miles) to between 500 and 1,000 km (311 to 621 miles) above our planet. The thermosphere is a layer of Earth's atmosphere that is directly above the mesosphere and below the exosphere. Earth's ionosphere, composed of several regions overlaps with and shares the same space as the thermosphere. The thermosphere is directly above the mesosphere and below the exosphere. ![]()
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March 2023
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