Subionospheric VLF Observations of Transmitter-Induced Precipitation of Inner Radiation Belt Electrons

Details Subionospheric VLF Observations of Transmitter-Induced Precipitation of Inner Radiation Belt Electrons Subionospheric VLF Observations of Transmitter-Induced Precipitation of Inner Radiation Belt Electrons

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm43b1496g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM43B-1496

Physics

2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2736 Magnetosphere/Ionosphere Interactions (2431), 2774 Radiation Belts, 2794 Instruments And Techniques

Scientific paper

Ionospheric effects of energetic electron precipitation induced by controlled injection of VLF signals from a ground based transmitter are observed via subionospheric VLF remote sensing. The 21.4 kHz NPM transmitter in Lualualei, Hawaii is keyed ON-OFF in a periodic sequence lasting 30 minutes. The same periodicity is observed in the amplitude and phase of the sub-ionospherically propagating signals of the 24.8 kHz NLK (Jim Creek, Washington) and 25.2 kHz NLM (LaMoure, North Dakota) transmitters measured at Midway Island. The NLM and NLK signal paths pass underneath the region of electron precipitation induced by the NPM transmitter, as predicted theoretically on the basis of cyclotron resonance interaction between energetic electrons and obliquely propagating whistler-mode waves injected by NPM. The ionospheric disturbances are consistent with that caused by conductivity enhancements resulting from secondary ionization produced by the precipitation of pitch angle scattered electrons in the 100-300 keV energy range. Periodic perturbations of the NLK signal observed at Palmer, Antarctica suggest that energetic electrons are scattered into both the bounce and drift loss cones. Utilizing a comprehensive model of magnetospheric wave-particle interaction, ionospheric energy deposition, and subionospheric VLF propagation, the precipitated energy flux is estimated to peak at L ~ 2 and ~ 3 x 10-4 [ergs s-1 cm-2]

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