Physics – Plasma Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11205309m&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A5, CiteID A05309
Physics
Plasma Physics
10
Ionosphere: Active Experiments, Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Magnetospheric Physics: Auroral Phenomena (2407), Radio Science: Waves In Plasma (7867), Space Plasma Physics: Active Perturbation Experiments
Scientific paper
We present calibrated measurements of ELF waves generated by modulated HF heating of the auroral electrojet by the High frequency Active Auroral Research Program (HAARP) HF transmitter in Gakona, Alaska, and detected after propagating more than 4400 km in the Earth-ionosphere waveguide to Midway Atoll. The magnitude of the 2125 Hz wave received at Midway Atoll is consistent with the radiation from a horizontal dipole located at the altitude of the maximum Hall conductivity variation (created by modulated HF heating) and radiating ~4-32 W. The HF-ELF conversion efficiency at HAARP is thus estimated to be ~0.0004-0.0032% for the 2125 Hz wave generated using sinusoidal amplitude modulation.
Bell Timothy F.
Inan Umran S.
Kennedy J. E.
Moore Robert C.
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