Studies of the ionospheric turbulence excited by the fourth gyroharmonic at HAARP
Abstract
A study is presented of artificial ionospheric turbulence (AIT) induced by HF heating at High Frequency Active Auroral Research Program (HAARP) using frequencies close to the fourth electron gyroharmonic, in a broad range of radiated powers and using a number of different diagnostics. The diagnostics include GPS scintillations, ground‐based stimulated electromagnetic emission (SEE), the HAARP ionosonde, Kodiak radar, and signals received at the Ukrainian Antarctic Station (UAS). The latter allowed analysis of waves scattered by the AIT into the ionospheric waveguide along Earth's terminator, 15.6 mm from the HAARP facility. For the first time, the amplitudes of two prominent SEE features, the downshifted maximum and broad upshifted maximum, were observed to saturate at ~50% of the maximum HAARP effective radiated power. Nonlinear effects in slant total electron content, SEE, and signals received at UAS at different transmitted frequencies and intensities of the pump wave were observed. The correlations between the data from different detectors demonstrate that the scattered waves reach UAS by the waveguide along the Earth's terminator, and that they were injected into the waveguide by scattering off of artificial striations produced by AIT above HAARP, rather than via direct injection from sidelobe radiation.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 01, 2015
- Source ID
- 10.1002/2015ja021341
Entities
People
- A. A. Sopin
- A. Mahmoudian
- A. Najmi
- A. V. Koloskov
- A. Zalizovski
- C. L. Siefring
- G. Milikh
- K. Papadopoulos
- Kin Seng Chiang
- M. Ruohoniemi
- P. A. Bernhardt
- S. J. Briczinski
- Shalina Taylor
- W. Bristow
- Y. M. Yampolski
- Y. Morton
Organizations
- Cornell University
- Defense Advanced Research Projects Agency
- Institute of Radio Astronomy of the National Academy of Sciences of Ukraine
- Miami University
- United States Naval Research Laboratory
- University of Alaska Fairbanks
- University of Maryland
- Virginia Tech