Studies of the Ionospheric Turbulence Excited by the Fourth Gyroharmonic at HAARP

Gennady M Milikh1, Amir Christopher Najmi2, Alireza Mahmoudian1, Paul A Bernhardt3, Stanley Briczinski4, Carl L Siefring5, Yuri Yampolski6, Oleksandr Koloskov7, Andrey Sopin7, Andriy Zalizovski8, Karen Chiang9, Mark L. Psiaki9, Yu Morton10, Steve Taylor11 and Konstantinos Papadopoulos12, (1)University of Maryland College Park, College Park, MD, United States, (2)University of Maryland, Columbia, MD, United States, (3)University of Alaska Fairbanks, Fairbanks, AK, United States, (4)Naval Research Laboratory, Washington, DC, United States, (5)Naval Research Laboratory, Plasma Physics Division, Washington, United States, (6)Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkov, Ukraine, (7)Institute of Radio Astronomy National Academy of Sciences of Ukraine, Kharkov, Ukraine, (8)Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Kharkiv, Ukraine, (9)Cornell University, Ithaca, NY, United States, (10)University of Colorado, Boulder, Aerospace Engineering Sciences, Boulder, United States, (11)Miami University, Electrical and Computer Engineering, Oxford, OH, United States, (12)University of Maryland College Park, Physics and Astronomy, College Park, MD, United States
Abstract:
We report the results of a set of experiments conducted during the HAARP June 2014 campaign, whose objective was to study the development of artificial ionospheric turbulence. During the experiments, the heating frequency was stepped up and down near the 4th gyroharmonic, and the power of the heating HF radiation was varied. Our diagnostics included: measurements of phase-derived Slant Total Electron Content using the L1/L2 signals from PRN 25 GPS satellite received at HAARP; measurements of Stimulated Electromagnetic Emission (SEE) conducted 15 km away from the HAARP site; detection of the HAARP HF radiation at Vernadsky station located in Antarctica ~15.6 Mm from HAARP; ionograms from HAARP’s digisonde and reflectance data from Kodiak radar. Our observations showed: a distinct correlation between the broad upshifted maximum detected by the SEE and strong suppression of the HF signals detected at Vernadsky station; drift velocity of the ionospheric irregularities causing HF scattering detected at Vernadsky station corresponds to that measured by the Kodiak radar; the intensity of the scattered radar signals by Kodiak correlates with the amplitude of downshifted maximum observed by the SEE.
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