Which temperature can be found at the upper limit of the thermosphere?

The upper limit of the thermosphere can reach temperatures as high as 2000 degrees Celsius. In this layer of the Earth's atmosphere, temperatures can rise significantly due to the absorption of intense solar radiation. Molecules in the thermosphere receive enough energy to become very energetic, which translates into high temperatures, although the air is so thin that it wouldn't feel hot to humans.

The temperature range in the thermosphere can vary based on solar activity and other factors. As one moves higher in the atmosphere, especially within the thermosphere, the temperature can increase due to the presence of a relatively small number of gas molecules being bombarded by solar radiation and cosmic rays. In this context, 2000 degrees Celsius is an accurate representation of the potential upper limit of the thermosphere, marking it as a significant temperature in understanding atmospheric science.