Optical ring formation by refraction from artificially produced density enhancements in HF heating experiments at HAARP

Details Optical ring formation by refraction from artificially produced density enhancements in HF heating experiments at HAARP Optical ring formation by refraction from artificially produced density enhancements in HF heating experiments at HAARP

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa11b..06p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA11B-06

Other

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2403] Ionosphere / Active Experiments, [6934] Radio Science / Ionospheric Propagation

Scientific paper

Since the upgrade of the High Frequency Active Auroral Research Program (HAARP) HF transmitter to 3.6 MW, bullseye patterns consisting of a ring around a sharp-edged central disc are commonly observed in optical measurements. These patterns are up to 40° across and cannot be explained by side lobes or other beam shape effects. Examination of these cases suggests they result from refraction by an artificially produced density bulge on the bottomside of the F region. We present tomographic reconstructions of the 3-D distribution of optical emissions from multi-site observations and compare this with ionosonde and GPS TEC density measurements as well as 427.8 nm nitrogen emissions, which provide an estimate of ionization production rates. Raytrace modeling of a variety of scenarios based on density measurements produces deflection and focusing of beam power into a ring consistent with the optical observations.

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