This is the lowest region of the ionosphere, starting from around 60 km above the Earth's surface to about 90 km. It is mainly composed of nitrogen and oxygen ions and is responsible for absorbing high-frequency radio waves.
This is the lowest region of the ionosphere, starting from around 60 km above the Earth's surface to about 90 km. It is mainly composed of nitrogen and oxygen ions and is responsible for absorbing high-frequency radio waves.