Introduction


The Blanket Effect is intended for others to learn about weather modification and its related subjects in an easy to understand way. Started in 2005, this blog is a work in progress as the technology advances

November 8, 2007

Straight From The Source

(note: excerpts are from The Naval Research Laboratory site)

The High Frequency Active Auroral Research Program

The High Frequency Active Auroral Research Program, jointly sponsored by the Office of Naval Research, the Air Force Research Laboratory, and DARPA, is constructing a new interactive ionospheric research facility in Gakona, Alaska, to conduct both basic and applied research in this scientific discipline.

Facility Description:

The HAARP Gakona Facility is located in a relatively remote region of south central Alaska where a variety of ionospheric conditions may occur, ranging from quiet to mid-latitude to auroral. The major feature of the facility is the high frequency (HF) phased array antenna, currently consisting of 48 elements. When [it was] completed in 2006, this array consist[ed] of 180 elements with performance parameters. (image right of the HAARP Gakona Facility, from NRL site)

The facility also includes a suite of 17 on-site scientific and diagnostic instruments including magnetometers, riometers, a digisonde, and three upper atmospheric radars. Work has begun on an incoherent scatter radar. Since becoming operational in March 1999, the HAARP Gakona Facility has been used in 27 research campaigns.

Generation of ELF/VLF Waves:

Much of the research at the facility is focused on the generation of ELF/VLF because of the value of these frequencies to the Navy for undersea applications. Propagating radio waves in the ELF/VLF frequency range are generated at the lower edge of the ionosphere when high-power HF radio waves modulate the conductivity of the ionospheric D and E layers in the presence of a background or "electrojet" current.

Optical Emissions:

The interaction of high-power radio waves with the ionospheric can produce faint optical emissions at specific wavelengths. Recent experiments at the HAARP Gakona Facility investigated the role of the HF beam pointing direction on the production of artificial airglow. (from the NRL site: The left-hand image shows the background star field with the HF transmitter off. The right-hand image was taken 63 s[econds] later with the HF transmitter on. Structure is evident in the emission region )

Lunar Radar Experiment:

In another experiment, measurements were made of lunar radar cross-section by transmitting high-power radar pulses directly at the Moon from the HAARP facility and receiving the echo pulses with the WAVES radio receiver onboard the NASA/WIND spacecraft. (image right is graph of 2001 Lunar/Radar experiment, from NRL site. click image for detail)

Conclusion:

Even though the HAARP facility is only partially complete, research results have already added new knowledge to the field of ionospheric interactions in basic and applied radio science. A primary focus area of the research program addresses communications and surveillance needs of the Navy with the potential to enable new capabilities for undersea applications.

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