Energetic electron precipitation induced by space based VLF transmitters

Details Energetic electron precipitation induced by space based VLF transmitters Energetic electron precipitation induced by space based VLF transmitters

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11309203k&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A9, CiteID A09203

Physics

Plasma Physics

1

Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Magnetosphere: Inner, Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Ionosphere: Particle Precipitation

Scientific paper

Numerical raytracing with Landau damping is used to calculate electron precipitation that would be induced by in situ sources located at L = 2 and L = 2.5, at the geomagnetic equator and also at a geomagnetic latitude of 20° along each field line. In accordance with the Wang and Bell (1970) model of antenna radiation in a magnetoplasma, we consider frequencies immediately below, approximately equal to, and 1 kHz above the local lower hybrid resonance frequency at each location and injected rays within 3° of the resonance cone. The magnetospherically reflecting (MR) whistler-mode waves that are injected from such in situ sources propagate with a wave normal angle very close to the resonance cone. Compared to a single-pass interaction, such MR waves precipitate up to 16 times more 100 keV to 5 MeV electrons. Waves injected at initial wave normal angles closer to the magnetic field, e.g., 45°, in fact precipitate fewer >1 MeV electrons than waves injected close to the resonance cone.

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