Why are satellites in the thermosphere?

Since numerous satellites circle inside the thermosphere, changes in the thickness of air at orbital heights expedited by warming and development of the thermosphere creates a drag power on satellites.

The thermosphere limit and the exosphere located above it is known as the thermopause. At the base of the thermosphere is the mesopause, the thermosphere boundary and the mesosphere underneath. Like the seas, Earth's air has waves and tides inside it. These waves and tides help move vitality around inside the environment, including the thermosphere.