Guest guest Posted June 11, 2006 Report Share Posted June 11, 2006 HAARP http://www.eyepod.org/TAC-HAARP.html Photo from a recent experiment where Haarp produced a visible Aurora accompanied by "Orbs". FRJ"HAARP", much more than meets the eye going on here, read the original DOD document which in itself is astounding, please pay close attention to the highlighted text. FRJ{ Icons provide links to relevant sites }Creation of visible artificial optical emissions in the auroraby high-power radio wavesTODD. R. PEDERSEN-[ 1 ]AND ELIZABETH A. GERKEN-[ 2 ]1] Space Vehicles Directorate, Air Force Research Laboratory, Hanscom Air Force Base, Massachusetts 01731, USA2] Department of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USACorrespondence and requests for materials should be addressed to T.R.P. (todd.pedersen).Generation of artificial light in the sky by means of high-power radio waves interacting with the ionospheric plasma has been envisaged since the early days of radio exploration of the upper atmosphere, with proposed applications ranging from regional night-time street lighting to atmospheric measurements. Weak optical emissions have been produced for decades in such ionospheric 'heating' experiments, where they serve as key indicators of electron acceleration, thermal heating, and other effects of incompletely understood wave–particle interactions in the plasma under conditions difficult to replicate in the laboratory. The extremely low intensities produced previously have, however, required sensitive instrumentation for detection, preventing applications beyond scientific research. Here we report observations of radio-induced optical emissions bright enough to be seen by the naked eye, and produced not in the quiet mid-latitude ionosphere, but in the midst of a pulsating natural aurora. This may open the door to visual applications of ionospheric heating technology or provide a way to probe the dynamics of the natural aurora and magnetosphere.The most readily observed emissions produced in ionospheric heating are the 'forbidden' red and green lines from atomic oxygen at 630.0 and 557.7 nm, both common components of the natural aurora and airglow3. In almost all past experiments, artificial emissions have been produced by the interaction of radio waves with the ionosphericF region, the long-lived primary ionospheric layer composed of atomic ions at an altitude of several hundred kilometres4. Only rarely have optical effects been reported from the ionospheric E region5, an ephemeral layer created from occasional meteoric ions or continuous solar illumination or auroral precipitation near an altitude of 100km , where increased collisions with neutral molecules alter the behaviour of the plasma, and the proximity to the transmitterprovides a large inverse-square increase in power density5. Emission intensities achieved previously have typically ranged up to several hundred Rayleighs (1 R = 106 photons cm-2 s-1 integrated along a line of sight) for the more easily excited red line and tens of Rayleighs for the higher-energy green line. In all cases, intensities have remained far below the threshold for detection by the human eye,which is given as 20 kR at 630 nm (ref. 2) towards the red end of the visible wavelength range, and 1 kR for 558 nm (ref. 6) near the peak > sensitivity of the eye.>We recently produced dramatically stronger artificial optical emissions bright enough to be visible to the naked eye in an experiment targeting the ionospheric E layer created by the natural aurora. The experiment was conducted on 10 March 2004, between 6–7UT, using the 960-kW transmitter array at the High Frequency Active Auroral Research Program (HAARP) facility near Gakona, Alaska (62.4° N, 145.15° W). The HAARP transmitter was run in a 15-s cycle alternating between 7.5 s of full power and 7.5 s off. Four filtered optical imaging systems ranging from all-sky to telescopic were operated in synchronization with the transmitter on and offintervals. Background conditions during the experiment period were characterized by aurora pulsating with apparent periods of 10 s in longitudinal bands running in the magnetic east–west direction over most of the sky, including the region within the transmitter beam (Fig. 1). The auroral precipitation created a blanketing E layer near an altitudeof 100 km with critical frequencies ranging from 4–6 MHz.For a period of approximately 10 min between about 06:40 and 06:50,a number of small speckles {Orbs FRJ } of enhanced green emissionwere observed with the HAARP telescope wide-field camera,which provided high-resolution images of the region within the transmitter beam near magnetic zenith The speckles were present only during the image frames when the transmitter was on and were absent from exposures taken duringthe off periods. There is evidence of dynamic pulsations in thebackground aurora within this narrower field of view as well, such as theauroral bands that appear and disappear in the lower left corner of the images. The largest speckles are approximately one degree across.Within a given frame the speckles { Orbs, FRJ } appear to be randomly distributed, but upon closer examination of successive 'on' frames, some of the speckles often appear to be correlated with but displaced from those seen in the previous 'on' period. This suggests that some speckle features are in motion but may still retain coherence across multiple on–off cycles of the transmitter.Calibrated average intensities for the background aurora within the transmitter beam were obtained from another imager, which made measurements at several different wavelengths once each minute. In spite of therapid pulsations in narrow bands and on 10-s timescales, the average auroral brightness at 557.7 nm remained near4 kR, with an increase to 5 kR near the time the speckles wereobserved. This intensity calibration, applied to the high-resolution data in Fig. 2, indicates that the brightest speckles were approximately 4 kR in total intensity, well above the threshold for visibility and 1 kR or more above the darker auroral regions.Given the unprecedented brightness of the speckles, we carried out a number of tests to rule out potential artefacts, including: repeating the transmission pattern at a different time to rule out radio-frequency (r.f.) interference with the camera electronics, verifying from radar records that no aircraft were in the area, and measuring the periods of white-light sources such as nearby communications towers and airport beacons. We attempted to reproduce the results whenever an aurora moved into range, but auroral events later in the experiment window never produced E layers of sufficient density to support significant transmissions at the originalfrequency again. More detailed analysis of the data revealed additionalweak speckles earlier in the original 6-UT hour, at about 06:20 UT, when he transmitter was operated at a lower frequency (and lowereffective power), and some of the brightest speckles were also identified in data from one of the other lower-resolution camera systems operated from a separate building, eliminating any doubt that the speckles represent actual light from the sky.Although visible levels of artificial optical emissions have notbeen reported previously, there have been other attempts made tostimulate the auroral E layer with radio waves. A similar experimentthat used low-light television cameras and a 2-s on–off cycle but different polarization reported an estimated modulation of less than 10 R, interpreted as radio-induced decreases in the green line emission7. Large-scale structural changes in the overhead aurora have been reported in conjunction with E-layer heating8, but the extremelysmall number of cases and the close similarity of the observed effects to naturally occurring processes make it difficult to assess the true influence of the radio waves on the auroral events. In contrast, the recent HAARP observations demonstrate clear on-off control of the > speckles over 50 or more complete cycles.Potential sources of the observed bright speckles fall into two categories: production in the local E-region ionosphere by the transmitter beam, or indirect creation by modification of the auroral particle precipitation, which then produces the optical speckles in the same way as the background aurora. If the speckles are locally generated, the role of the natural aurora would probably be limitedto creation of the E layer for the radio waves to interact with, and it might be possible to generate similar phenomena in non-auroral E layers independent of any specific on-off cycling, a potentially desirable condition for creation of visible artificial light. If, on the other hand, the speckles result from modification of the auroral particle population, perhaps through perturbations to currentsflowing in the E layer or a wave resonance, we expect that the specific frequency of the on–off cycling relative to the natural pulsation frequencies might be a critical parameter, and experiments of this type could potentially become a new tool for exploration of time-dependent processes in the aurora and magnetosphere.Received 13 September 2004;accepted 6 December 2004Cont................ Quote Link to comment Share on other sites More sharing options...
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