Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11b1735k&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11B-1735
Physics
Plasma Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2774] Magnetospheric Physics / Radiation Belts, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
It has been suggested that the slot region, which separates the inner and outer radiation belts, forms as the result of a balance between inward radial diffusion and pitch angle scattering. In this study, we examined the respective roles to the formation and maintenance of the electron slot of radial diffusion and three different wave types: plasmaspheric hiss, lightening-generated whistlers and VLF transmitter signals (f=17.1 kHz and 22.3 kHz). The Fokker-Planck equation including radial and pitch angle diffusion is solved for an idealized storm. We show that during storms, strong electric perturbation can lead to an injection of electrons into the slot, while pitch angle diffusion resulting from resonant interactions with all the waves considered in this study produce a loss of relativistic electron. Comparison of the numerical simulations with CRRES observations and 1-d radial diffusion simulations with data derived lifetimes is also done to examine the viability of the assumed wave models. The numerical simulations show that the overall time evolution of observed two-zone structure is in a good agreement with our model expected to result from a balance between inward radial diffusion and pitch angle diffusion. However, when inward radial diffusion due to the electrostatic fluctuation is included, lack of a good agreement between observed and simulated fluxes suggests that the accurate dependence of radial diffusion coefficients on the inner L-shell may need to be determined.
Kim Kyounghee
Ni Binbin
Shprits Yuri Y.
Subbotin Dmitriy
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