Thank you for joining VF Outlet's VIP Rewards! Every time you visit any VF Outlet store and make a purchase you will receive points towards earning a $10 reward. Register online today to track your progress towards earning a reward and receive notifications of special offers, events and promotions.
1 E layer: The next layer beyond the D layer is called the E layer. 2  This exists at an altitude of between 100 and 125 km. 3  Instead of acting chiefly as an attenuator, this layer reflects radio signals although they still undergo some attenuation.
Below 30 MHz, the ionosphere, at altitudes from around 100 to 500 km, absorbs and reflects signals. Above 30 GHz, the lower atmosphere or troposphere, below 10 km, absorbs radio signals due to oxygen and water vapour.