NRL Scientists Produce Densest Artificial Ionospheric Plasma Clouds Using HAARP - U.S. Naval Research Laboratory
http://www.nrl.navy.mil/media/news-releases/2013/nrl-scientists-produce-densest-artificial-ionospheric-plasma-clouds-using-haarp
http://www.nrl.navy.mil/media/news-releases/2013/nrl-scientists-produce-densest-artificial-ionospheric-plasma-clouds-using-haarp