Open AccessELF waves generated by modulated HF heating of the auroral electrojet and observed at a ground distance of ∼4400 km
Author(s) -
Moore R. C.,
Inan U. S.,
Bell T. F.,
Kennedy E. J.
Publication year - 2007
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2006ja012063
Subject(s) - electrojet , ionosphere , physics , amplitude , equatorial electrojet , atoll , high frequency , geophysics , dipole , computational physics , atmospheric sciences , optics , geology , magnetic field , reef , earth's magnetic field , oceanography , quantum mechanics
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.