HAARP will zap the upper atmosphere with a focused and steerable
electromagnetic beam. It is an advanced model of an "ionospheric
heater." (The ionosphere is the electrically charged sphere
surrounding Earth's upper atmosphere. It ranges between about 40 to
600 miles above Earth's surface.)
Put simply, the apparatus for HAARP is a reversal of a radio
telescope: antennas send out signals instead of receiving. HAARP is
the test run for a superpowerful radio-wave beaming technology that
lifts areas of the ionosphere by focusing a beam and heating those
areas. Electromagnetic waves then bounce back onto Earth and
penetrate everything — living and dead. HAARP publicity gives the
impression that the High-frequency Active Auroral Research Project
is mainly an academic project with the goal of changing the
ionosphere to improve communications for our own good. However,
other U.S. military documents put it more clearly: HAARP aims to
learn how to "exploit the ionosphere for Department of Defense
purposes." Communicating with submarines is only one of those
purposes.