Whistler mode illumination of the plasmaspheric resonant cavity via in situ injection of ELF/VLF waves

Details Whistler mode illumination of the plasmaspheric resonant cavity via in situ injection of ELF/VLF waves Whistler mode illumination of the plasmaspheric resonant cavity via in situ injection of ELF/VLF waves

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11110215k&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A10, CiteID A10215

Physics

1

Magnetospheric Physics: Energetic Particles: Precipitating, Ionosphere: Wave/Particle Interactions (7867), Radio Science: Waves In Plasma (7867), Magnetospheric Physics: Magnetosphere: Inner

Scientific paper

Numerical ray tracing indicates that the in situ injection of whistler mode waves of 1 kHz to 4 kHz can be used to illuminate the inner radiation belts and slot region. These results were derived by using the Stanford VLF Ray Tracing Program to simulate sources placed at a total of six points in the inner magnetosphere: L = 1.5, L = 2.0, and L = 2.5 at two geomagnetic latitudes, the equator and a latitude of 20° along each field line. The results demonstrate that an in situ source, by varying the frequency of the injected waves, can illuminate L shells both higher and lower than the source site, with wave frequencies below (above) the local lower hybrid resonance, fLHR, moving to higher (lower) L shells. Accounting for the limitations that would be imposed by a practical antenna immersed in the magnetospheric medium restricts the radiating wave frequency, f, to 0.9 fLHR <= F < (fLHR + 1 kHz), and the wave normal angle at injection to no farther than 3° from the resonance cone. Even after accounting for these restrictions, it requires only three in situ sources placed at the above locations to illuminate 1.4 $\simeq$ L $\simeq$ 2.7, which comprises the bulk of the inner radiation belt.

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