Reevaluating subionospheric detection of transmitter-induced precipitation of inner radiation belt electrons

Details Reevaluating subionospheric detection of transmitter-induced precipitation of inner radiation belt electrons Reevaluating subionospheric detection of transmitter-induced precipitation of inner radiation belt electrons

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1384g&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1384

Physics

Plasma Physics

[2455] Ionosphere / Particle Precipitation, [2774] Magnetospheric Physics / Radiation Belts, [6964] Radio Science / Radio Wave Propagation, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Very low frequency (VLF) electromagnetic waves can interact with energetic electrons trapped in the Earth’s magnetosphere causing some of those electrons to exit their trapped motion and precipitate upon the upper atmosphere. Previously published results on subionospheric VLF observations of transmitter-induced precipitation of inner radiation belt electrons are reevaluated using additional data sets, processing techniques, and modeling. The previously stated detection of transmitter-induced precipitation is brought into question due to the lack of delay between the VLF transmissions and the observed perturbations. Through analysis of the subionospheric VLF transmission pathways and full-wave modeling of VLF perturbations caused by ionospheric disturbances, the scattering of the VLF probe waves from the keyed transmitter's heating region is presented as a more probable cause for the observed perturbations. Suggestions are made for alterations to future transmitter-induced precipitation experiments in order to better eliminate the heating region as a confounding variable and increase the likelihood of detecting transmitter-induced electron precipitation.

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