Pulsating patch of man-made aurora

At the Department of Communication Systems, Lancaster University, the Space Plasma Environment and Radio Science group is working on an extraordinary project: to beam narrow jets of radio energy into the ionosphere and create controllable artificial aurorae. These experiments use high-power radio transmitters belonging to the US Air Force Research Lab in Alaska, the EISCAT Radar Association in Norway and the British-built SPEAR facility on Svalbard, designed and operated by the University of Leicester.

http://www.sunearthplan.net/5/26/Man-made-aurorae