Sites

Ionospheric Heating (Popularity: )
http://ion.le.ac.uk/heating/heating.html
overview of the high power RF modification facility at Ramfjordmoen, Norway.

Ionospheric Prediction Service (IPS) Radio & Space Services (Popularity: )
http://www.ips.gov.au/
unit of the Australian Government providing radio propagation and space environment services.

High-Frequency Active Auroral Research Program (HAARP) (Popularity: )
http://www.haarp.alaska.edu/
scientific research facility devoted to the study of the Earth's ionosphere.

Super Dual Auroral Radar Network (SuperDARN) (Popularity: )
http://superdarn.jhuapl.edu/
network of high-frequency radars used to study the Earth's ionosphere.