Imaging HF-induced large-scale irregularities above HAARP

Details Imaging HF-induced large-scale irregularities above HAARP Imaging HF-induced large-scale irregularities above HAARP

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3304107d&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 4, CiteID L04107

Physics

6

Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ionospheric Irregularities, Radio Science: Interferometry (1207, 1209, 1242), Radio Science: Nonlinear Phenomena (4400, 7839)

Scientific paper

The University of Massachusetts-Lowell digisonde is used with the HAARP high-frequency (HF), ionospheric modification facility to obtain radio images of artificially-produced, large-scale, geomagnetic field-aligned irregularities. F region irregularities generated with the HAARP beam pointed in the vertical and geomagnetic field-aligned directions are examined in a smooth background plasma. It is found that limited large-scale irregularity production takes place with vertical transmissions, whereas there is a dramatic increase in the number of source irregularities with the beam pointed parallel to the geomagnetic field. Strong irregularity production appears to be confined to within ~5° of the geomagnetic zenith and does not fill the volume occupied by the HF beam. A similar effect is observed in optical images of artificial airglow.

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