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LONG-DISTANCE DETECTION OF ELF MODULATED BY HAARP

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  • humlobotomist
    LONG-DISTANCE DETECTION OF ELF WAVES GENERATED VIA MODULATED HF HEATING OF THE AURORAL ELECTRO-JET The High-frequency Active Auroral Research Program (HAARP)
    Message 1 of 1 , Jul 31, 2006
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      LONG-DISTANCE DETECTION OF ELF WAVES GENERATED
      VIA MODULATED HF HEATING OF THE AURORAL ELECTRO-JET


      The High-frequency Active Auroral Research Program (HAARP) HF
      transmitter in Gakona, Alaska robustly generates electromagnetic
      ELF/VLF signals via modulated heating of the lower ionosphere.
      ELF/VLF signals produced in this manner propagate to large distances
      in the Earth-ionosphere waveguide with relatively low attenuation.
      Between 0800 and 1200 UT on February 11, 2005, the HAARP HF
      transmitter modulated the auroral electrojet currents, generating ELF
      waves alternately at 575 and 2125 Hz, each for 60 minutes at a time.

      Each of the ELF signals produced were detected at an ELF/VLF receiver
      35 km from the HAARP facility. The ELF/VLF receiver at Midway Atoll,
      located in the middle of the Pacific Ocean at a distance of 4500 km
      from the HAARP facility, detected the 2125 Hz transmission between
      1100 and 1200 UT.

      This 4500 km ground distance separation between the ELF signal source
      and the receiver constitutes the largest distance at which HAARP-
      generated ELF/VLF waves have been detected to date. In this paper, we
      quantitatively assess the characteristics of the ELF/VLF source
      region using an Earth-ionosphere waveguide propagation model with
      realistic electromagnetic parameters together with the observed
      properties of the ELF signals detected both in the near field and in
      the far field.

      Near field measurements are used to calculate the relative excitation
      magnitudes and phases of a set of effective Hall and Pedersen
      dipoles, the radiation from which is shown to be consistent with far
      field observations for radiated power levels on the order of several
      tens of Watts.

      In addition, our results suggest that a single dipole located between
      60 and 85 km altitude cannot accurately model the polarization
      ellipse observed in the far field at Midway Atoll, despite the 4500
      km distance between the signal source and the receiver. This
      observation underscores the importance of the Earth-ionosphere
      waveguide mode-excitation process as it relates to a distributed body
      of radiating currents such as that present above the HAARP HF heater
      array.


      http://strike.colorado.edu/~sjg/URSI/data/moore9046.pdf
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