Resonant diffusion of radiation belt electrons by whistler-mode chorus

Details Resonant diffusion of radiation belt electrons by whistler-mode chorus Resonant diffusion of radiation belt electrons by whistler-mode chorus

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30i..46h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 9, pp. 46-1, CiteID 1493, DOI 10.1029/2003GL016963

Physics

Plasma Physics

63

Space Plasma Physics: Wave/Particle Interactions, Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

We present the first relativistic electron pitch-angle and momentum diffusion rates for scattering by whistler-mode waves in the low density regieme. Diffusion rates are strongly dependent on the ratio between the electron plasma and gyro-frequencies ωpe/Ωe. For conditions typical of storm times, diffusion rates at a few MeV increase by more than 3 orders of magnitude as ωpe/Ωe is reduced from 10 to 1.5. Diffusion rates are extremely sensitive to energy and become ineffective above 3 MeV. At energies below 100 keV pitch-angle diffusion approaches strong diffusion loss to the atmosphere, while loss at higher energies is much weaker. For storm-time whistler-mode chorus amplitudes near 100 pT, and ωpe/Ωe <= 2.5, acceleration timescales can be less than a day at 1 MeV. This indicates that chorus diffusion could provide an important mechanism for local acceleration during the recovery phase of storms outside the plasmapause.

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