Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm22a..03g&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM22A-03
Physics
2716 Energetic Particles, Precipitating, 2720 Energetic Particles, Trapped, 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
Magnetospheric amplification of ducted ELF/VLF signals has been known and documented for over three decades. Research at Siple Station, Antarctica during the period 1972-89 illustrated many cases of ducting, amplification and emission triggering from waves launched on magnetic field lines and reflected from the ionospheric boundary in the conjugate hemisphere. Once reflected (one-hop) and twice reflected (two-hop) signals were found to occur for approximately 45% of transmissions on field lines ranging from L = 3 to L = 5. ELF/VLF wave generation via HF heating of D-region electrojet currents offers the potential for further controlled wave injection experiments. Signals generated by the High Frequency Active Auroral Research Program (HAARP) facility in Alaska have been observed extensively on the ground and in space. Recent observation of one-hop and two-hop echoes generated by HAARP [Inan et al., 2004] offers the ability to study cyclotron resonance wave amplification and emission triggering mechanisms. We report on the characteristics of the echoes and present a survey of statistical occurence of ducted magnetospherically amplified signals excited by the HAARP HF heater. The survey encompasses both geomagnetic activity and local ionospheric conditions.
Gokowski M.
Inan Umran S.
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