Located at an altitude of around 90 km to 150 km, this region is the next in the sequence. It is ionized by ultraviolet radiation from the sun and is responsible for reflecting medium frequency (MF) radio waves.
Located at an altitude of around 90 km to 150 km, this region is the next in the sequence. It is ionized by ultraviolet radiation from the sun and is responsible for reflecting medium frequency (MF) radio waves.