Multi-hop whistler-mode ELF/VLF signals and triggered emissions excited by the HAARP HF heater

Details Multi-hop whistler-mode ELF/VLF signals and triggered emissions excited by the HAARP HF heater Multi-hop whistler-mode ELF/VLF signals and triggered emissions excited by the HAARP HF heater

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124805i&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 24, CiteID L24805

Physics

14

Ionosphere: Active Experiments, Ionosphere: Wave/Particle Interactions, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Instruments And Techniques

Scientific paper

Modulated heating of the lower ionosphere with the HAARP HF heater is used to excite 1-2 kHz signals observed on a ship-borne receiver in the geomagnetic conjugate hemisphere after propagating as ducted whistler-mode signals. These 1-hop signals are believed to be amplified, and are accompanied by triggered emissions. Simultaneous observations near (~30 km) HAARP show 2-hop signals which travel to the northern hemisphere upon reflection from the ionosphere in the south. Multiple reflected signals, up to 10-hop, are detected, with the signal dispersing and evolving in shape, indicative of re-amplification and re-triggering of emissions during successive traversals of the equatorial interaction regions.

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