HAARP: Its purpose is to analyze the ionosphere and investigate the potential for developing ionospheric enhancement technology for radio communications and surveillance purposes (such as missile detection).

http://en.wikipedia.org/wiki/High_Frequency_Active_Auroral_Research_Program

Don't join the nutbars thinking that HAARP, CERN's LHC, etc. are goverment conspiracies designed to cause earthquakes, tempests and plagues of locusts.