​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​Working Party 3L (WP 3L) - Ionospheric and ground-wave propagation prediction and radio noise​

Working Party 3L is responsible for providing information and developing models describing the fundamental principles and mechanisms for radio-wave propagation in and through ionized media,​ and developing prediction methods for ground-wave propagation between terrestrial stations below 30 MHz and paths affected by the ionosphere. It also addresses the topic of radio noise arising from both natural and man-made sources and to quantify the levels of such noise.​​

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