At the point when a radio wave goes into the ionospheric layer it encounters refraction because of difference in atmospheric density. The thickness of ionospheric layer is rarer than the layer underneath which makes the radio wave be twisted far from the ordinary. Additionally the radio wave encounters a force from the particles in the ionospheric layer.If incident at the correct angle the radio wave is completely reflected back to the inner atmosphere due to total internal reflection. This phenomenon is called ionospheric reflection and is used in mobile communication for radio wave propagation also known as ionospheric bending of radio waves.