The ionosphere (/aɪˈɒnəˌsfɪər/) is the ionized part of Earth's upper atmosphere, from about 48 km (30 mi) to 965 km (600 mi) altitude, a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation.

What is ionosphere also called?

It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth. It is also called as thermosphere.

Is thermosphere also called ionosphere?

This layer is composed of electrically charged ions that are responsible for reflecting the radio waves back to the Earth's surface. Due to the presence of these ions, thermosphere is also known as ionosphere.