Diffusion of Radiation Belt Electrons in Three Dimensions

Details Diffusion of Radiation Belt Electrons in Three Dimensions Diffusion of Radiation Belt Electrons in Three Dimensions

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm34a..01p&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM34A-01

Physics

7807 Charged Particle Motion And Acceleration, 7843 Numerical Simulation Studies, 7867 Wave/Particle Interactions, 2720 Energetic Particles, Trapped

Scientific paper

A model is developed describing magnetic and electric fields associated with poloidal-mode Pc5 ULF waves. The frequency and L dependence of the ULF wave power is included in this model by incorporating published ground-based magnetometer data. The influence of ultra low frequency (ULF) waves in the Pc5 frequency range on radiation belt electrons in a dipole magnetic field is examined. The three dimensional dynamics of relativistic electrons are simulated using guiding center approximation equations to track the bounce and drift motion of particles. This is the first analysis in three dimensions utilizing model ULF wave electric and magnetic fields on the guiding center trajectories of relativistic electrons. It is demonstrated here that realistic spectral characteristics play a significant role in the rate of diffusion of relativistic electrons via drift resonance with poloidal mode ULF waves. Radial diffusion rates including bounce motion are calculated for α eq ≥ 610 (λ ≤ 200). L and energy dependence of diffusion rates are also calculated. A compression is then added to the dipole field model and diffusion rates are compared to equatorial plane results. The diffusion coefficient maximizes for 900 pitch angles when radial and frequency dependence of ULF wave power matches observations. This suggests that simulations of relativistic electron dynamics in the equatorial plane can serve as an upper limit in modeling flux or phase space density evolution.

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