Journal articles
DEMETER observations of an intense upgoing column of ELF/VLF radiation excited by the HAARP HF heater
Abstract : 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 ' 900 km contains waves which propagate in the Earth-ionosphere waveguide and then leak upward to the spacecraft. The second region of d ' 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 ' 350 mV/m, B ' 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.
https://hal-insu.archives-ouvertes.fr/insu-03037212
Contributor : Nathalie Pothier <>
Submitted on : Thursday, December 3, 2020 - 7:46:11 AM
Last modification on : Friday, December 4, 2020 - 3:22:34 AM
Contributor : Nathalie Pothier <>
Submitted on : Thursday, December 3, 2020 - 7:46:11 AM
Last modification on : Friday, December 4, 2020 - 3:22:34 AM
File
2008JA013208.pdf
Publisher files allowed on an open archive