Technical Details about the HAARP Program

The HF Transmitter
Transmitter Technical Information

Comparison With Other High Power Facilities

The Phases of Completion

The Developmental Prototype (DP)

Map of the HAARP Site

Performance Calculator Page

EIS description of the HF Transmitter

The Antenna Array
Overview of the Antenna

Anticipated Technical Performance

Science Observatory Instruments
Scientific Instrument Listing

Scientific Data Index

Other Technical Information
Prime Power Generation

About the Land

The HAARP Ionospheric Research facility will be a major Arctic facility for conducting upper atmospheric research. The facility will consist of two essential parts:
  1. A high power transmitter and antenna array operating in the High Frequency (HF) range. When complete, the transmitter will be capable of producing up to 3.6 million Watts to an antenna system consisting of 180 crossed dipole antennas arranged as a rectangular, planar array.

  2. A complete and extensive set of scientific instruments for observation of both the background auroral ionosphere and of the effects produced during active research using the transmitter system. Output from these instruments will be combined into an integrated data package which will be available throughout the country in near real time.
During active ionospheric research, the signal generated by the transmitter system is delivered to the antenna array, transmitted in an upward direction, and is partially absorbed, at an altitude between 100 to 350 km (depending on operating frequency), in a small volume a few hundred meters thick and a few tens of kilometers in diameter over the site. The intensity of the HF signal in the ionosphere is less than 3 microwatts per cm2, tens of thousands of times less than the Sun's natural electromagnetic radiation reaching the earth and hundreds of times less than even the normal random variations in intensity of the Sun's natural ultraviolet (UV) energy which creates the ionosphere. The small effects that are produced, however, can be observed with the sensitive scientific instruments and these observations can provide new information about the dynamics of plasmas and new insight into the processes of solar-terrestrial interactions.

HAARP Main Page
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Last updated June 12, 1997