High-Frequency Active Auroral Research Program (HAARP) (Popularity: )

scientific research facility devoted to the study of the Earth's ionosphere.

Ionospheric Prediction Service (IPS) Radio & Space Services (Popularity: )

unit of the Australian Government providing radio propagation and space environment services.

Ionospheric Heating (Popularity: )

overview of the high power RF modification facility at Ramfjordmoen, Norway.

Super Dual Auroral Radar Network (SuperDARN) (Popularity: )

network of high-frequency radars used to study the Earth's ionosphere.