DEMETER observations of plasma density irregularities induced above powerful VLF transmitters and their connection with energetic proton precipitation from the radiation belts

Details DEMETER observations of plasma density irregularities induced above powerful VLF transmitters and their connection with energetic proton precipitation from the radiation belts DEMETER observations of plasma density irregularities induced above powerful VLF transmitters and their connection with energetic proton precipitation from the radiation belts

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43b1583b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43B-1583

Physics

2403 Active Experiments, 2439 Ionospheric Irregularities, 2455 Particle Precipitation, 2483 Wave/Particle Interactions (7867), 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Recent DEMETER observations show the existence of extensive induced plasma density irregularities above the powerful VLF transmitter North West Cape (NWC) in Australia. Presumably the irregularities are produced through heating of the ionospheric plasma by the VLF transmitter signals. DEMETER observations sometimes show that the E field of the NWC signals exhibits a significant doppler shift. This can be interpreted to indicate that electromagnetic whistler mode signals from the NWC transmitter excite quasi- electrostatic whistler mode waves as the input signals propagate through the induced irregularities. If the quasi-electrostatic whistler mode waves can propagate to the magnetic equator without significant attenuation, they can interact with radiation belt particles through gyro-resonance and Landau resonance to produce energetic particle precipitation. We consider the case of energetic proton precipitation, calculate the proton pitch angle diffusion coefficient on the L shells near NWC, and estimate the proton lifetime on these field lines.

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