High Frequency Active Auroral Research Program
Encyclopedia
The High Frequency Active Aurora
Aurora (astronomy)
An aurora is a natural light display in the sky particularly in the high latitude regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere...

l Research Program (HAARP)
is an ionospheric
Ionosphere
The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere...

 research program jointly funded by the U.S. Air Force
United States Air Force
The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

, the U.S. Navy
United States Navy
The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

, the University of Alaska, and the Defense Advanced Research Projects Agency
Defense Advanced Research Projects Agency
The Defense Advanced Research Projects Agency is an agency of the United States Department of Defense responsible for the development of new technology for use by the military...

 (DARPA).

Built by BAE Advanced Technologies
BAE Systems
BAE Systems plc is a British multinational defence, security and aerospace company headquartered in London, United Kingdom, that has global interests, particularly in North America through its subsidiary BAE Systems Inc. BAE is among the world's largest military contractors; in 2009 it was the...

 (BAEAT), its purpose is to analyze the ionosphere and investigate the potential for developing ionospheric enhancement technology for radio communications and surveillance.
The HAARP program operates a major Arctic facility, named the HAARP Research Station, on an Air Force–owned site near Gakona, Alaska
Gakona, Alaska
Gakona is a census-designated place in the Valdez-Cordova Census Area in the U.S. state of Alaska. As of the 2000 census, the population of the CDP was 215.-Geography and climate:...

.

The most prominent instrument at the HAARP Station is the Ionospheric Research Instrument (IRI), a high-power radio frequency
Radio frequency
Radio frequency is a rate of oscillation in the range of about 3 kHz to 300 GHz, which corresponds to the frequency of radio waves, and the alternating currents which carry radio signals...

 transmitter
Transmitter
In electronics and telecommunications a transmitter or radio transmitter is an electronic device which, with the aid of an antenna, produces radio waves. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating...

 facility operating in the high frequency
High frequency
High frequency radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters . Frequencies immediately below HF are denoted Medium-frequency , and the next higher frequencies are known as Very high frequency...

 (HF) band. The IRI is used to temporarily excite a limited area of the ionosphere. Other instruments, such as a VHF and a UHF
Ultra high frequency
Ultra-High Frequency designates the ITU Radio frequency range of electromagnetic waves between 300 MHz and 3 GHz , also known as the decimetre band or decimetre wave as the wavelengths range from one to ten decimetres...

 radar
Radar
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio...

, a fluxgate
Fluxgate compass
The basic fluxgate compass is a simple electromagnetic device that employs two or more small coils of wire around a core of highly permeable magnetic material, to directly sense the direction of the horizontal component of the earth's magnetic field...

 magnetometer
Magnetometer
A magnetometer is a measuring instrument used to measure the strength or direction of a magnetic field either produced in the laboratory or existing in nature...

, a digisonde
Ionospheric sounding
In telecommunication and radio science, an ionospheric sounding is a technique that provides real-time data on high-frequency ionospheric-dependent radio propagation, using a basic system consisting of a synchronized transmitter and receiver....

, and an induction magnetometer, are used to study the physical processes that occur in the excited region.

Work on the HAARP Station began in 1993. The current working IRI was completed in 2007, and its prime contractor was BAE Systems Advanced Technologies
BAE Systems Inc.
BAE Systems Inc. is a major subsidiary of the British defense and aerospace company BAE Systems plc. As per its Special Security Agreement, BAE Systems Inc...

. As of 2008, HAARP had incurred around $250 million in tax-funded construction and operating costs.

HAARP has been blamed by conspiracy theorists
Conspiracy theory
A conspiracy theory explains an event as being the result of an alleged plot by a covert group or organization or, more broadly, the idea that important political, social or economic events are the products of secret plots that are largely unknown to the general public.-Usage:The term "conspiracy...

 for a range of events, including numerous natural disaster
Natural disaster
A natural disaster is the effect of a natural hazard . It leads to financial, environmental or human losses...

s. Scientists have commented that HAARP is an attractive target for conspiracy theorists because "its purpose seems deeply mysterious to the scientifically uninformed".

Objectives

The HAARP project directs a 3.6 MW signal, in the 2.8–10 MHz region of the HF [high-frequency] band, into the ionosphere. The signal may be pulsed or continuous. Then, effects of the transmission and any recovery period can be examined using associated instrumentation, including VHF and UHF radars, HF receivers, and optical cameras. According to the HAARP team, this will advance the study of basic natural processes that occur in the ionosphere under the natural but much stronger influence of solar interaction, and how the natural ionosphere affects radio signals.

This will enable scientists to develop methods to mitigate these effects to improve the reliability or performance of communication and navigation systems, which would have a wide range of uses, civilian and military, such as an increased accuracy of GPS navigation, and advances in underwater and underground research and applications. This may lead to improved methods for submarine communication, or an ability to remotely sense and map the mineral content of the terrestrial subsurface, and perhaps underground complexes, of regions or countries, among other things. The current facility lacks the range to reach these countries, but the research could be used to develop a mobile platform.

The HAARP program began in 1990. The project is funded by the Office of Naval Research
Office of Naval Research
The Office of Naval Research , headquartered in Arlington, Virginia , is the office within the United States Department of the Navy that coordinates, executes, and promotes the science and technology programs of the U.S...

 and jointly managed by the ONR and Air Force Research Laboratory
Air Force Research Laboratory
The Air Force Research Laboratory is a scientific research organization operated by the United States Air Force Materiel Command dedicated to leading the discovery, development, and integration of affordable aerospace warfighting technologies; planning and executing the Air Force science and...

, with the principal involvement of the University of Alaska. Many other universities and educational institutions have been involved in the development of the project and its instruments, namely the University of Alaska Fairbanks, Stanford University
Stanford University
The Leland Stanford Junior University, commonly referred to as Stanford University or Stanford, is a private research university on an campus located near Palo Alto, California. It is situated in the northwestern Santa Clara Valley on the San Francisco Peninsula, approximately northwest of San...

, Penn State University (ARL), Boston College
Boston College
Boston College is a private Jesuit research university located in the village of Chestnut Hill, Massachusetts, USA. The main campus is bisected by the border between the cities of Boston and Newton. It has 9,200 full-time undergraduates and 4,000 graduate students. Its name reflects its early...

, UCLA, Clemson University
Clemson University
Clemson University is an American public, coeducational, land-grant, sea-grant, research university located in Clemson, South Carolina, United States....

, Dartmouth College
Dartmouth College
Dartmouth College is a private, Ivy League university in Hanover, New Hampshire, United States. The institution comprises a liberal arts college, Dartmouth Medical School, Thayer School of Engineering, and the Tuck School of Business, as well as 19 graduate programs in the arts and sciences...

, Cornell University
Cornell University
Cornell University is an Ivy League university located in Ithaca, New York, United States. It is a private land-grant university, receiving annual funding from the State of New York for certain educational missions...

, Johns Hopkins University
Johns Hopkins University
The Johns Hopkins University, commonly referred to as Johns Hopkins, JHU, or simply Hopkins, is a private research university based in Baltimore, Maryland, United States...

, University of Maryland, College Park
University of Maryland, College Park
The University of Maryland, College Park is a top-ranked public research university located in the city of College Park in Prince George's County, Maryland, just outside Washington, D.C...

, University of Massachusetts
University of Massachusetts
This article relates to the statewide university system. For the flagship campus often referred to as "UMass", see University of Massachusetts Amherst...

, MIT
Massachusetts Institute of Technology
The Massachusetts Institute of Technology is a private research university located in Cambridge, Massachusetts. MIT has five schools and one college, containing a total of 32 academic departments, with a strong emphasis on scientific and technological education and research.Founded in 1861 in...

, Polytechnic Institute of New York University, and the University of Tulsa
University of Tulsa
The University of Tulsa is a private university awarding bachelor's, master's, and doctoral degrees located in Tulsa, Oklahoma, USA. It is currently ranked 75th among doctoral degree granting universities in the nation by US News and World Report and is listed as one of the "Best 366 Colleges" by...

. The project's specifications were developed by the universities, which are continuing to play a major role in the design of future research efforts.

According to HAARP's management, the project strives for openness, and all activities are logged and publicly available. Scientists without security clearances, even foreign nationals, are routinely allowed on site. The HAARP facility regularly (once a year on most years according to the HAARP home page) hosts open houses, during which time any civilian may tour the entire facility. In addition, scientific results obtained with HAARP are routinely published in major research journals (such as Geophysical Research Letters
Geophysical Research Letters
Geophysical Research Letters is a semi-monthly peer reviewed scientific journal published by the American Geophysical Union that was established in 1974...

, or Journal of Geophysical Research
Journal of Geophysical Research
The Journal of Geophysical Research is a peer-reviewed scientific journal published by the American Geophysical Union 80 times per year. It contains original research on the physical, chemical, and biological processes that contribute to the understanding of the Earth, Sun, and solar system...

), written both by university scientists (American and foreign) or by U.S. Department of Defense research lab scientists. Each summer, the HAARP holds a summer school for visiting students, including foreign nationals, giving them an opportunity to do research with one of the world's foremost research instruments.

Research

HAARP's main goal is basic science research of the uppermost portion of the atmosphere, termed the ionosphere. Essentially a transition between the atmosphere and the magnetosphere
Magnetosphere
A magnetosphere is formed when a stream of charged particles, such as the solar wind, interacts with and is deflected by the intrinsic magnetic field of a planet or similar body. Earth is surrounded by a magnetosphere, as are the other planets with intrinsic magnetic fields: Mercury, Jupiter,...

, the ionosphere is where the atmosphere is thin enough that the sun's X-rays and UV rays can reach it, but thick enough that there are still enough molecules present to absorb those rays. Consequently, the ionosphere consists of a rapid increase in density of free electrons, beginning at ~70 km, reaching a peak at ~300 km, and then falling off again as the atmosphere disappears entirely by ~1000 km. Various aspects of HAARP can study all of the main layers of the ionosphere.

The profile of the ionosphere is highly variable, changing constantly on timescales of minutes, hours, days, seasons, and years. This profile becomes even more complex near earth's magnetic poles, where the nearly vertical alignment and intensity of earth's magnetic field can cause physical effects like aurorae
Aurora (astronomy)
An aurora is a natural light display in the sky particularly in the high latitude regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere...

.

The ionosphere is traditionally very difficult to measure. Balloons cannot reach it because the air is too thin, but satellites cannot orbit there because the air is still too thick. Hence, most experiments on the ionosphere give only small pieces of information. HAARP approaches the study of the ionosphere by following in the footsteps of an ionospheric heater called EISCAT
EISCAT
EISCAT is an acronym for the European Incoherent Scatter Scientific Association. It operates three incoherent scatter radar systems, at 224 MHz, 931 MHz in Northern Scandinavia and one at 500 MHz on Svalbard, used to study the interaction between the Sun and the Earth as revealed by disturbances in...

 near Tromsø
Tromsø
Tromsø is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø.Tromsø city is the ninth largest urban area in Norway by population, and the seventh largest city in Norway by population...

, Norway. There, scientists pioneered exploration of the ionosphere by perturbing it with radio waves in the 2–10 MHz range, and studying how the ionosphere reacts. HAARP performs the same functions but with more power and a more flexible and agile HF beam.

Some of the main scientific findings from HAARP include
  1. Generating very low frequency
    Very low frequency
    225px|thumb|right|A VLF receiving antenna at [[Palmer Station]], Antarctica, operated by Stanford UniversityVery low frequency or VLF refers to radio frequencies in the range of 3 kHz to 30 kHz. Since there is not much bandwidth in this band of the radio spectrum, only the very simplest signals...

     radio waves by modulated heating of the auroral electrojet
    Electrojet
    An electrojet is an electric current which travels around the E region of the Earth's ionosphere. There are two electrojets: above the magnetic equator , and near the Northern and Southern Polar Circles . Electrojets are Hall currents carried primarily by electrons at altitudes from 100 to...

    , useful because generating VLF waves ordinarily requires gigantic antennas
  2. Generating weak luminous glow (measurable, but below that visible with a naked eye) from absorbing HAARP's signal
  3. Generating extremely low frequency
    Extremely low frequency
    Extremely low frequency is a term used to describe radiation frequencies from 3 to 300 Hz. In atmosphere science, an alternative definition is usually given, from 3 Hz to 3 kHz...

     waves in the 0.1 Hz range. These are next to impossible to produce any other way, because the length of a transmit antenna is dictated by the wavelength of the signal it must emit.
  4. Generating whistler-mode
    Whistler (radio)
    A whistler is a very low frequency electromagnetic wave which can be generated, for example, by lightning. Frequencies of terrestrial whistlers are 1 to 30 kHz, with maximum usually at 3 to 5 kHz. Although they are electromagnetic waves, they occur at audio frequencies, and can be...

     VLF signals that enter the magnetosphere
    Magnetosphere
    A magnetosphere is formed when a stream of charged particles, such as the solar wind, interacts with and is deflected by the intrinsic magnetic field of a planet or similar body. Earth is surrounded by a magnetosphere, as are the other planets with intrinsic magnetic fields: Mercury, Jupiter,...

     and propagate to the other hemisphere, interacting with Van Allen radiation belt
    Van Allen radiation belt
    The Van Allen radiation belt is a torus of energetic charged particles around Earth, which is held in place by Earth's magnetic field. It is believed that most of the particles that form the belts come from solar wind, and other particles by cosmic rays. It is named after its discoverer, James...

     particles along the way
  5. VLF remote sensing of the heated ionosphere


Research
Research
Research can be defined as the scientific search for knowledge, or as any systematic investigation, to establish novel facts, solve new or existing problems, prove new ideas, or develop new theories, usually using a scientific method...

 at the HAARP includes
  1. Ionospheric
    Ionosphere
    The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere...

     super heating
  2. Plasma
    Plasma (physics)
    In physics and chemistry, plasma is a state of matter similar to gas in which a certain portion of the particles are ionized. Heating a gas may ionize its molecules or atoms , thus turning it into a plasma, which contains charged particles: positive ions and negative electrons or ions...

     line observations
  3. Stimulated electron emission
    Beta decay
    In nuclear physics, beta decay is a type of radioactive decay in which a beta particle is emitted from an atom. There are two types of beta decay: beta minus and beta plus. In the case of beta decay that produces an electron emission, it is referred to as beta minus , while in the case of a...

     observations
  4. Gyro frequency heating research
  5. Spread F observations
  6. High velocity trace runs
  7. Airglow
    Airglow
    Airglow is the very weak emission of light by a planetary atmosphere. In the case of Earth's atmosphere, this optical phenomenon causes the night sky to never be completely dark .-Development:The airglow phenomenon was first identified in 1868 by Swedish scientist...

     observations
  8. Heating induced scintillation
    Scintillation (astronomy)
    Scintillation or twinkling are generic terms for rapid variations in apparent brightness or color of a distant luminous object viewed through a medium, most commonly the atmosphere ....

     observations
  9. VLF and ELF
    Extremely low frequency
    Extremely low frequency is a term used to describe radiation frequencies from 3 to 300 Hz. In atmosphere science, an alternative definition is usually given, from 3 Hz to 3 kHz...

     generation observations
  10. Radio
    Radio
    Radio is the transmission of signals through free space by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space...

     observations of meteor
    METEOR
    METEOR is a metric for the evaluation of machine translation output. The metric is based on the harmonic mean of unigram precision and recall, with recall weighted higher than precision...

    s
  11. Polar mesospheric summer echoes
    Polar mesospheric summer echoes
    Polar mesospheric summer echoes is the phenomenon of anomalous radar echoes found between 80-90 km in altitude from May through early August in the Arctic, and from November through to February in the Antarctic. These strong radar echoes are associated with the extremely cold temperatures that...

     (PMSE) have been studied, probing the mesosphere
    Mesosphere
    The mesosphere is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere. In the mesosphere temperature decreases with increasing height. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring...

     using the IRI as a powerful radar
    Radar
    Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio...

    , and with a 28 MHz radar, and two VHF radars at 49 MHz and 139 MHz. The presence of multiple radars spanning both HF
    High frequency
    High frequency radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters . Frequencies immediately below HF are denoted Medium-frequency , and the next higher frequencies are known as Very high frequency...

     and VHF bands allows scientists to make comparative measurements that may someday lead to an understanding of the processes that form these elusive phenomena.
  12. Research on extraterrestrial
    Outer space
    Outer space is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles: predominantly a plasma of hydrogen and helium, as well as electromagnetic radiation, magnetic fields, and neutrinos....

     HF radar echos: the Lunar Echo experiment (2008).
  13. Testing of Spread Spectrum
    Spread spectrum
    Spread-spectrum techniques are methods by which a signal generated in a particular bandwidth is deliberately spread in the frequency domain, resulting in a signal with a wider bandwidth...

     Transmitters (2009)
  14. Meteor shower impacts on the ionosphere
  15. Response and recovery of the ionosphere from solar flares and geomagnetic storms
  16. The effect of ionospheric disturbances on GPS satellite signal quality

Instrumentation and operation

The main instrument at HAARP Station is the Ionospheric Research Instrument (IRI). This is a high power, high-frequency phased array
Phased array
In wave theory, a phased array is an array of antennas in which the relative phases of the respective signals feeding the antennas are varied in such a way that the effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions.An antenna array...

 radio transmitter
Transmitter
In electronics and telecommunications a transmitter or radio transmitter is an electronic device which, with the aid of an antenna, produces radio waves. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating...

 with a set of 180 antennas
Antenna (radio)
An antenna is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver...

, disposed in an array of 12x15 units that occupy a rectangle of about 33 acres (13 hectares). The IRI is used to temporarily energize a small portion of the ionosphere
Ionosphere
The ionosphere is a part of the upper atmosphere, comprising portions of the mesosphere, thermosphere and exosphere, distinguished because it is ionized by solar radiation. It plays an important part in atmospheric electricity and forms the inner edge of the magnetosphere...

. The study of these disturbed volumes yields important information for understanding natural ionospheric processes.

During active ionospheric research, the signal generated by the transmitter system is delivered to the antenna array
Antenna array
Antenna array may refer to:*Antenna array a group of isotropic radiators such that the currents running through them are of different amplitudes and phases*Interferometric array of radio telescopes used in radio astronomy...

 and transmitted in an upward direction. At an altitude between 70 km (43 mi) to 350 km (217 mi) (depending on operating frequency), the signal is partially absorbed in a small volume several tens of kilometers in diameter and a few meters thick over the IRI. The intensity of the HF
High frequency
High frequency radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters . Frequencies immediately below HF are denoted Medium-frequency , and the next higher frequencies are known as Very high frequency...

 signal in the ionosphere is less than 3 µW/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
Ultraviolet
Ultraviolet light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, in the range 10 nm to 400 nm, and energies from 3 eV to 124 eV...

 (UV) energy which creates the ionosphere. The small effects that are produced, however, can be observed with the sensitive scientific instruments installed at the HAARP Station, and these observations can provide information about the dynamics of plasmas
Plasma (physics)
In physics and chemistry, plasma is a state of matter similar to gas in which a certain portion of the particles are ionized. Heating a gas may ionize its molecules or atoms , thus turning it into a plasma, which contains charged particles: positive ions and negative electrons or ions...

 and insight into the processes of solar-terrestrial interactions.

Each antenna element consists of a crossed dipole
Dipole
In physics, there are several kinds of dipoles:*An electric dipole is a separation of positive and negative charges. The simplest example of this is a pair of electric charges of equal magnitude but opposite sign, separated by some distance. A permanent electric dipole is called an electret.*A...

 that can be polarized for linear, ordinary mode (O-mode), or extraordinary mode (X-mode) transmission and reception. Each part of the two section crossed dipoles are individually fed from a custom built transmitter, that has been specially designed with very low distortion. The Effective Radiated Power
Effective radiated power
In radio telecommunications, effective radiated power or equivalent radiated power is a standardized theoretical measurement of radio frequency energy using the SI unit watts, and is determined by subtracting system losses and adding system gains...

 (ERP) of the IRI is limited by more than a factor of 10 at its lower operating frequencies. Much of this is due to higher antenna losses and a less efficient antenna pattern.

The IRI can transmit between 2.7 and 10 MHz, a frequency range that lies above the AM radio broadcast band and well below Citizens' Band frequency allocations. The HAARP Station is licensed to transmit only in certain segments of this frequency range, however. When the IRI is transmitting, the bandwidth of the transmitted signal is 100 kHz or less. The IRI can transmit in continuous waves (CW) or in pulses as short as 10 microseconds (µs). CW transmission is generally used for ionospheric modification, while transmission in short pulses frequently repeated is used as a radar system. Researchers can run experiments that use both modes of transmission, first modifying the ionosphere for a predetermined amount of time, then measuring the decay of modification effects with pulsed transmissions.

There are other geophysical instruments for research at the Station. Some of them are:
  • A fluxgate
    Fluxgate compass
    The basic fluxgate compass is a simple electromagnetic device that employs two or more small coils of wire around a core of highly permeable magnetic material, to directly sense the direction of the horizontal component of the earth's magnetic field...

     magnetometer
    Magnetometer
    A magnetometer is a measuring instrument used to measure the strength or direction of a magnetic field either produced in the laboratory or existing in nature...

     built by the University of Alaska Fairbanks Geophysical Institute
    Geophysical Institute
    The Geophysical Institute of the University of Alaska Fairbanks conducts research into space physics and aeronomy; atmospheric sciences; snow, ice, and permafrost; seismology; volcanology; and tectonics and sedimentation. It was founded in 1946 by the United States Congress...

    , available to chart variations in the Earth's magnetic field. Rapid and sharp changes of it may indicate a geomagnetic storm
    Geomagnetic storm
    A geomagnetic storm is a temporary disturbance of the Earth's magnetosphere caused by a disturbance in the interplanetary medium. A geomagnetic storm is a major component of space weather and provides the input for many other components of space weather...

    .
  • A digisonde
    Ionospheric sounding
    In telecommunication and radio science, an ionospheric sounding is a technique that provides real-time data on high-frequency ionospheric-dependent radio propagation, using a basic system consisting of a synchronized transmitter and receiver....

     that provides ionospheric profiles, allowing scientists to choose appropriate frequencies for IRI operation. The HAARP makes current and historic digisonde information available online.
  • An induction magnetometer, provided by the University of Tokyo
    University of Tokyo
    , abbreviated as , is a major research university located in Tokyo, Japan. The University has 10 faculties with a total of around 30,000 students, 2,100 of whom are foreign. Its five campuses are in Hongō, Komaba, Kashiwa, Shirokane and Nakano. It is considered to be the most prestigious university...

    , that measures the changing geomagnetic field in the Ultra Low Frequency
    Ultra low frequency
    Ultra-low frequency is the frequency range of electromagnetic waves between 300 hertz and 3 kilohertz. In magnetosphere science and seismology, alternative definitions are usually given, including ranges from 1 mHz to 100 Hz, 1 mHz to 1 Hz, 10 mHz to 10 Hz...

     (ULF) range of 0–5 Hz.

Site

The project site (62°23′30"N 145°09′03"W) is north of Gakona
Gakona, Alaska
Gakona is a census-designated place in the Valdez-Cordova Census Area in the U.S. state of Alaska. As of the 2000 census, the population of the CDP was 215.-Geography and climate:...

, Alaska
Alaska
Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait...

 just west of Wrangell-Saint Elias National Park. An environmental impact statement
Environmental impact statement
An environmental impact statement , under United States environmental law, is a document required by the National Environmental Policy Act for certain actions "significantly affecting the quality of the human environment". An EIS is a tool for decision making...

 led to permission for an array of up to 180 antennas to be erected. The HAARP has been constructed at the previous site of an over-the-horizon radar
Over-the-horizon radar
Over-the-horizon radar, or OTH , is a design concept for radar systems to allow them to detect targets at very long ranges, typically up to thousands of kilometers...

 (OTH) installation. A large structure, built to house the OTH now houses the HAARP control room, kitchen, and offices. Several other small structures house various instruments.
The HAARP site has been constructed in three distinct phases:
  1. The Developmental Prototype (DP) had 18 antenna elements, organized in three columns by six rows. It was fed with a total of 360 kilowatts (kW) combined transmitter output power. The DP transmitted just enough power for the most basic of ionospheric testing.
  2. The Filled Developmental Prototype (FDP) had 48 antenna units arrayed in six columns by eight rows, with 960 kW of transmitter power. It was fairly comparable to other ionospheric heating facilities. This was used for a number of successful scientific experiments and ionospheric exploration campaigns over the years.
  3. The Final IRI (FIRI) is the final build of the IRI. It has 180 antenna units, organized in 15 columns by 12 rows, yielding a theoretical maximum gain of 31 dB
    Decibel
    The decibel is a logarithmic unit that indicates the ratio of a physical quantity relative to a specified or implied reference level. A ratio in decibels is ten times the logarithm to base 10 of the ratio of two power quantities...

    . A total of 3.6 MW of transmitter power will feed it, but the power is focused in the upward direction by the geometry of the large phased array
    Phased array
    In wave theory, a phased array is an array of antennas in which the relative phases of the respective signals feeding the antennas are varied in such a way that the effective radiation pattern of the array is reinforced in a desired direction and suppressed in undesired directions.An antenna array...

     of antennas which allow the antennas to work together in controlling the direction. , all the antennas were in place, the final phase was completed and the antenna array
    Antenna array
    Antenna array may refer to:*Antenna array a group of isotropic radiators such that the currents running through them are of different amplitudes and phases*Interferometric array of radio telescopes used in radio astronomy...

     was undergoing testing aimed at fine-tuning its performance to comply with safety requirements required by regulatory agencies. The facility officially began full operations in its final 3.6 MW transmitter power completed status in the summer of 2007, yielding an effective radiated power (ERP) of 5.1 Gigawatts or 97.1 dBW at maximum output. However, the site typically operates at a fraction of that value due to the lower antenna gain
    Antenna gain
    In electromagnetics, an antenna's power gain or simply gain is a key performance figure which combines the antenna's directivity and electrical efficiency. As a transmitting antenna, the figure describes how well the antenna converts input power into radio waves headed in a specified direction...

     exhibited at standard operational frequencies.

Related facilities

In America, there are two related ionospheric heating
Ionospheric heater
An ionospheric heater is an array of antennas which are used for heating the ionosphere, and which can create artificial aurora.- Current facilities :...

 facilities: the HIPAS, near Fairbanks, Alaska
Fairbanks, Alaska
Fairbanks is a home rule city in and the borough seat of the Fairbanks North Star Borough in the U.S. state of Alaska.Fairbanks is the largest city in the Interior region of Alaska, and second largest in the state behind Anchorage...

, which was dismantled in 2009, and (currently offline for reconstruction) one at the Arecibo Observatory
Arecibo Observatory
The Arecibo Observatory is a radio telescope near the city of Arecibo in Puerto Rico. It is operated by SRI International under cooperative agreement with the National Science Foundation...

 in Puerto Rico
Puerto Rico
Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

. The European Incoherent Scatter Scientific Association (EISCAT) operates an ionospheric heating facility, capable of transmitting over 1 GW effective radiated power
Effective radiated power
In radio telecommunications, effective radiated power or equivalent radiated power is a standardized theoretical measurement of radio frequency energy using the SI unit watts, and is determined by subtracting system losses and adding system gains...

 (ERP), near Tromsø
Tromsø
Tromsø is a city and municipality in Troms county, Norway. The administrative centre of the municipality is the city of Tromsø.Tromsø city is the ninth largest urban area in Norway by population, and the seventh largest city in Norway by population...

, Norway
Norway
Norway , officially the Kingdom of Norway, is a Nordic unitary constitutional monarchy whose territory comprises the western portion of the Scandinavian Peninsula, Jan Mayen, and the Arctic archipelago of Svalbard and Bouvet Island. Norway has a total area of and a population of about 4.9 million...

. Russia
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

 has the Sura Ionospheric Heating Facility
Sura Ionospheric Heating Facility
The Sura Ionospheric Heating Facility, located near the small town of Vasilsursk about 100 km eastward from Nizhniy Novgorod in Russia, is a laboratory for ionosphere research. Sura is capable of radiating about 190 MW, effective radiated power on short waves. This facility is operated by the...

, in Vasilsursk
Vasilsursk
Vasilsursk is an urban locality in Vorotynsky District of Nizhny Novgorod Oblast, Russia, located on the Sura River, not far from its fall into the Volga. Population:...

 near Nizhniy Novgorod, capable of transmitting 190 MW ERP.

Conspiracy theories

HAARP is the subject of numerous conspiracy theories, with individuals ascribing various hidden motives and capabilities to the project. Journalist Sharon Weinberger
Sharon Weinberger
Sharon Weinberger is an American journalist and writer on defense and security issues. She is currently a Carnegie/Newhouse School Legal Reporting Fellow where her "project will examine a legally murky intersection between ethics and fraud in military contracting"...

 called HAARP "the Moby Dick of conspiracy theories" and said the popularity of conspiracy theories often overshadows the benefits HAARP may provide to the scientific community.

The alleged dangers of HAARP were dramatized in popular culture by Marvel Comics
Marvel Comics
Marvel Worldwide, Inc., commonly referred to as Marvel Comics and formerly Marvel Publishing, Inc. and Marvel Comics Group, is an American company that publishes comic books and related media...

, author Tom Clancy
Tom Clancy
Thomas Leo "Tom" Clancy, Jr. is an American author, best known for his technically detailed espionage, military science, and techno thriller storylines set during and in the aftermath of the Cold War, along with video games on which he did not work, but which bear his name for licensing and...

 (the novel Breaking Point in the Net Force
Tom Clancy's Net Force
Tom Clancy's Net Force is a novel series, created by Tom Clancy and Steve Pieczenik and written by Steve Perry. It is set in 2010 and charts the actions of Net Force: a special division of the FBI set up to combat increasing crime on the internet....

series), and The X-Files
The X-Files
The X-Files is an American science fiction television series and a part of The X-Files franchise, created by screenwriter Chris Carter. The program originally aired from to . The show was a hit for the Fox network, and its characters and slogans became popular culture touchstones in the 1990s...

. A Russian military journal wrote that ionospheric testing would "trigger a cascade of electrons that could flip earth's magnetic poles." The European Parliament
European Parliament
The European Parliament is the directly elected parliamentary institution of the European Union . Together with the Council of the European Union and the Commission, it exercises the legislative function of the EU and it has been described as one of the most powerful legislatures in the world...

 and the Alaska state legislature
Alaska Legislature
The Alaska Legislature is the state legislature of the U.S. state of Alaska. It is a bicameral institution, consisting of the lower Alaska House of Representatives, with 40 members, and the upper house Alaska Senate, with 20 members...

 held hearings about HAARP, the former citing "environmental concerns." Author of the self-published Angels Don't Play This HAARP, Nick Begich
Nick Begich (author)
Nicholas John Begich, Jr. is a writer, lecturer and conspiracy theorist, who is the forerunner in the conspiracy theories associated with the High Frequency Active Auroral Research Program. Begich wrote and published the book Angels Don't Play This HAARP in the mid-1990s...

 has told lecture audiences that HAARP could trigger earthquakes and turn the upper atmosphere into a giant lens so that "the sky would literally appear to burn."

A 2009 episode of The History Channel
The History Channel
History, formerly known as The History Channel, is an American-based international satellite and cable TV channel that broadcasts a variety of reality shows and documentary programs including those of fictional and non-fictional historical content, together with speculation about the future.-...

 series That's Impossible speculated that ionospheric heating from HAARP could theoretically cause localized atmospheric upcurrents that disrupt or "bend" the jet stream and influence regional weather patterns, prompting conspiracy theorists to connect changed weather patterns in the Atlantic Ocean during the 1980s and subsequent El Niño events with HAARP.

Former Governor of Minnesota
Governor of Minnesota
The Governor of Minnesota is the chief executive of the U.S. state of Minnesota, leading the state's executive branch. Forty different people have been governors of the state, though historically there were also three governors of Minnesota Territory. Alexander Ramsey, the first territorial...

 and noted conspiracy theorist Jesse Ventura
Jesse Ventura
James George Janos , better known as Jesse Ventura, is an American politician, the 38th Governor of Minnesota from 1999 to 2003, Navy UDT veteran, former SEAL reservist, actor, and former radio and television talk show host...

 questions whether the government is using the site to manipulate the weather or to bombard people with mind-controlling radio waves. An Air Force spokeswoman said Ventura made an official request to visit the research station but was rejected, "and he and his crew show up at HAARP anyway and were denied access."

Conspiracy theorists have linked HAARP to numerous earthquakes. An opinion piece on a Venezuela
Venezuela
Venezuela , officially called the Bolivarian Republic of Venezuela , is a tropical country on the northern coast of South America. It borders Colombia to the west, Guyana to the east, and Brazil to the south...

n state-run television channel's website named HAARP as a cause of the 2010 Haiti earthquake
2010 Haiti earthquake
The 2010 Haiti earthquake was a catastrophic magnitude 7.0 Mw earthquake, with an epicentre near the town of Léogâne, approximately west of Port-au-Prince, Haiti's capital. The earthquake occurred at 16:53 local time on Tuesday, 12 January 2010.By 24 January, at least 52 aftershocks...

.

Skeptic computer scientist David Naiditch called HAARP "a magnet for conspiracy theorists", saying the project has been blamed for triggering catastrophes such as flood
Flood
A flood is an overflow of an expanse of water that submerges land. The EU Floods directive defines a flood as a temporary covering by water of land not normally covered by water...

s, drought
Drought
A drought is an extended period of months or years when a region notes a deficiency in its water supply. Generally, this occurs when a region receives consistently below average precipitation. It can have a substantial impact on the ecosystem and agriculture of the affected region...

s, hurricanes, thunderstorm
Thunderstorm
A thunderstorm, also known as an electrical storm, a lightning storm, thundershower or simply a storm is a form of weather characterized by the presence of lightning and its acoustic effect on the Earth's atmosphere known as thunder. The meteorologically assigned cloud type associated with the...

s, and devastating earthquake
Earthquake
An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. The seismicity, seismism or seismic activity of an area refers to the frequency, type and size of earthquakes experienced over a period of time...

s in Pakistan
Pakistan
Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

 and the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

 aimed to shake up "terrorists." Naiditch says HAARP has been blamed for diverse events including major power outage
Power outage
A power outage is a short- or long-term loss of the electric power to an area.There are many causes of power failures in an electricity network...

s, the downing of TWA Flight 800
TWA Flight 800
Trans World Airlines Flight 800 , a Boeing 747-131, exploded and crashed into the Atlantic Ocean near East Moriches, New York, on July 17, 1996, at about 20:31 EDT, 12 minutes after takeoff, killing all 230 persons on board. At the time, it was the second-deadliest U.S...

, Gulf War syndrome
Gulf War syndrome
Gulf War syndrome or Gulf War illness describes a medical condition that affected veterans and civilians who were near conflicts during or downwind of chemical weapons depot demolition, after the 1991 Gulf War. A wide range of acute and chronic symptoms have included fatigue, musculoskeletal...

, and chronic fatigue syndrome
Chronic fatigue syndrome
Chronic fatigue syndrome is the most common name used to designate a significantly debilitating medical disorder or group of disorders generally defined by persistent fatigue accompanied by other specific symptoms for a minimum of six months, not due to ongoing exertion, not substantially...

. Conspiracy theorists have also suggested links between HAARP and the work of Nikola Tesla
Nikola Tesla
Nikola Tesla was a Serbian-American inventor, mechanical engineer, and electrical engineer...

 (particularly potential combinations of HAARP energy with Tesla's work on pneumatic small-scale earthquake generation
Tesla's oscillator
Tesla's electro-mechanical oscillator or earthquake machine is a steam-powered mechanical oscillator invented by Nikola Tesla in 1898. The machine which Tesla tested was small, around seven inches long, and weighing one or two pounds; something "you could put in your overcoat pocket"...

) and physicist Bernard Eastlund
Bernard Eastlund
Bernard J. Eastlund was a physicist who received his B.S. in physics from MIT and a his Ph.D. in physics from Columbia University. In 1970 he received a Special Achievement Certificate from the U. S...

. According to Naiditch, HAARP is an attractive target for conspiracy theorists because "its purpose seems deeply mysterious to the scientifically uninformed".

In popular culture

A fictionalized HAARP was the setting for a stage in the X-Men Legends
X-Men Legends
X-Men Legends is an action role-playing video game developed by Raven Software and published by Activision. It was released on the GameCube, PlayStation 2 and Xbox consoles in the fall of . Barking Lizards Technologies developed the N-Gage port of the game, which was released in early...

 game.
HAARP was also featured in the animated series G.I. Joe: Resolute
G.I. Joe: Resolute
G.I. Joe: Resolute is an animated television series based on the G.I. Joe franchise. It was written by Warren Ellis, directed by Joaquim Dos Santos, and produced by Sam Register. The series debuted on the web at Adult Swim Video April 18, 2009, with a Content Rating of TV-14-V, and premiered in its...

and in the first episode of Conspiracy Theory with Jesse Ventura
Conspiracy Theory with Jesse Ventura
Conspiracy Theory with Jesse Ventura is an American television series hosted by Jesse Ventura and broadcast on truTV . It premiered on December 2, 2009, and is produced by A. Smith & Co. Productions. A second season premiered on October 15, 2010...

.

See also

  • Ionospheric reflection
    Ionospheric reflection
    Ionospheric reflection is a bending, through a complex process involving reflection and refraction, of electromagnetic waves propagating in the ionosphere back toward the Earth....

  • EISCAT
    EISCAT
    EISCAT is an acronym for the European Incoherent Scatter Scientific Association. It operates three incoherent scatter radar systems, at 224 MHz, 931 MHz in Northern Scandinavia and one at 500 MHz on Svalbard, used to study the interaction between the Sun and the Earth as revealed by disturbances in...

  • HIPAS
  • Poker Flat Research Range
    Poker Flat Research Range
    The Poker Flat Research Range is a launch facility and rocket range for sounding rockets in the U.S. state of Alaska, owned and operated by the University of Alaska Fairbanks Geophysical Institute since 1968...

  • SuperDARN
  • Sura Ionospheric Heating Facility
    Sura Ionospheric Heating Facility
    The Sura Ionospheric Heating Facility, located near the small town of Vasilsursk about 100 km eastward from Nizhniy Novgorod in Russia, is a laboratory for ionosphere research. Sura is capable of radiating about 190 MW, effective radiated power on short waves. This facility is operated by the...


Further reading

Patents
  • C. W. Hansell (1945)."Communication system by pulses through the Earth", .
  • R. L. Tanner (1965). "Extremely low-frequency antenna", .
  • G. F. Leydorf (1966). "Antenna near field coupling system", .
  • B. J. Eastlund
    Bernard Eastlund
    Bernard J. Eastlund was a physicist who received his B.S. in physics from MIT and a his Ph.D. in physics from Columbia University. In 1970 he received a Special Achievement Certificate from the U. S...

     (1987). "Method and apparatus for altering a region in the Earth's atmosphere, ionosphere, and/or magnetosphere", .
  • B. J. Eastlund (1991). "Method for producing a shell of relativistic particles at an altitude above the earths surface", .

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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