what is the temperature gradient of the thermosphere
The thermosphere is characterized by a positive temperature gradient, which is equal to zero at the mesopause, has a maximum value between 100 and 200 km, and again becomes equal to zero near the base of the exosphere, where the atmosphere becomes practically isothermal.he layer of the upper atmosphere located between the mesopauseâthat is, the upper boundary of the mesosphereâand the base of the exosphere. On the average, the thermosphere extends from a height of about 80 km to a height of about 500 km; these limits vary by Â±10â20 percent.