DEMETER observations of an intense upgoing column of ELF/VLF radiation excited by the HAARP HF heater

Details DEMETER observations of an intense upgoing column of ELF/VLF radiation excited by the HAARP HF heater DEMETER observations of an intense upgoing column of ELF/VLF radiation excited by the HAARP HF heater

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11310308p&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A10, CiteID A10308

Physics

7

Ionosphere: Active Experiments, Ionosphere: Wave/Particle Interactions (7867), Ionosphere: Wave Propagation (0689, 3285, 4275, 4455, 6934), Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

DEMETER spacecraft observations of ELF signals generated by the recently upgraded High-Frequency Active Auroral Research Program (HAARP) HF facility (3.6 MW) reveal three distinctive regions characterizing upgoing ELF waves. These regions are classified by signal intensity and the minimum lateral distance d between the magnetic footprint of the satellite at 75-km altitude (D layer) and the point at 75-km altitude immediately above HAARP where the source is located. The first large region within d $\simeq$ 900 km contains waves which propagate in the Earth-ionosphere waveguide and then leak upward to the spacecraft. The second region of d $\simeq$ 200-300 km contains waves propagating to the spacecraft from the ionospheric source region without reflection from the ground. The third region contains waves of very high intensity (E $\simeq$ 350 μV/m, B $\simeq$ 20 pT) within a narrow cylindrical column of ~10-20 km radius, also observed once before on the ISIS 1 spacecraft. The observed intense columnar radiation is consistent with predictions of a recent full-wave model of ELF radiation from HF-heater-produced ionospheric source currents.

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