Question

the temperature increases rapidly after which layer

Answer 1

The ionosphere (/aɪˈɒnəˌsfɪər/[1][2]) is the ionized part of Earth's upper atmosphere, from about 60 km (37 mi) to 1,000 km (620 mi) altitude, a region that includes thethermosphere and parts of the mesosphereand exosphere. The ionosphere is ionized by solar radiation. It plays an important role inatmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on the Earth