Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm33a0342n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM33A-0342
Physics
2716 Energetic Particles: Precipitating, 2720 Energetic Particles: Trapped, 2774 Radiation Belts, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Radiation belt electrons can undergo gyroresonant diffusion in their interaction with various magnetospheric wave-modes. To determine the timescales for electron momentum diffusion and pitch-angle diffusion,we develop bounce-averaged quasi-linear resonant diffusion coefficients for field-aligned electromagnetic waves in a hydrogen or multi-ion (H+,He+,O+) plasma. We assume that the Earth's magnetic field is dipolar and that the wave frequency spectrum is Gaussian. Evaluation of the diffusion coefficients requires the solution of a sixth-order polynomial equation for the resonant wave frequencies in the case of a multi-ion (H+,He+,O+) plasma, compared to the solution of a fourth-order polynomial equation for a hydrogen plasma. We calculate timescales for radiation belt electron acceleration and loss due to gyroresonance with VLF chorus outside the plasmasphere,and both ELF hiss and EMIC waves inside the plasmasphere. Timescales for momentum diffusion of MeV electrons due to VLF chorus can be less than a day in the outer radiation belt. Precipitation timescales due to pitch-angle scattering by each of the wave modes,chorus,hiss,or EMIC waves,can be of the order of hours or days ,dependent on the spectral properties of the waves and the background magnetic field and number density.In some cases,diffusion coefficients for field-aligned waves can provide a valuable approximation for diffusion rates for oblique waves calculated using higher-order resonances.
Meredith Nigel P.
Ni Binbin
Summers Donald
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