Optical signatures of radiation belt electron precipitation induced by ground-based VLF transmitters

Details Optical signatures of radiation belt electron precipitation induced by ground-based VLF transmitters Optical signatures of radiation belt electron precipitation induced by ground-based VLF transmitters

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11508206m&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A8, CiteID A08206

Physics

3

Ionosphere: Particle Precipitation, Ionosphere: Midlatitude Ionosphere, Magnetospheric Physics: Radiation Belts, Ionosphere: Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

Numerical simulations are presented of optical emissions in the ionosphere due to electron precipitation caused by ground-based VLF transmitters. Ray tracing and precipitation calculations are made to estimate the flux precipitated from the inner magnetosphere for existing ground-based VLF transmitters as well as hypothetical transmitters with controlled parameters. The resulting precipitated fluxes are used to estimate ionization profiles through Monte Carlo simulations, and the ionization profiles are converted to photon volume emission rates. The results are extended over a range of L shells and longitudes. Results show that the NWC transmitter at North West Cape, Australia, creates the strongest optical signature because of its high power, latitude of ˜35°, and low frequency. The resulting optical signal has a peak of <0.1 R; however, we calculate that this should be detectable using sensitive photometric instruments and controlled modulation experiments.

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