Radio frequency propagation modeling is an integral part of a wide variety of scientific studies and
technological applications. Many models and applications consider the effects of ionospheric refraction,
magneto-ionic splitting, plasma and neutral collisions, scintillation, traveling ionospheric disturbances,
sporadic-E, spread-F, and land-surface interactions. Recent advances in computational power, as well as
data collection, storage, and distribution capabilities, have led to an improved ability to include these
effects at a higher fidelity, and modern digital signal processing techniques have led to an improved
ability to assess the utility of including them. This session seeks contributions covering advancements in
measurement, modelling, and prediction techniques pertinent to the interaction of radio waves with the
ionosphere in either a skywave or transionospheric propagation mode. Contributions highlighting
improvements in our ability to include and understand the Earth’s interactions with these propagation
modes are especially encouraged.