Bounce-averaged diffusion coefficients in a realistic field model for oblique chorus waves

Details Bounce-averaged diffusion coefficients in a realistic field model for oblique chorus waves Bounce-averaged diffusion coefficients in a realistic field model for oblique chorus waves

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm33c1919o&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM33C-1919

Physics

[2730] Magnetospheric Physics / Magnetosphere: Inner

Scientific paper

We present the results of computations of bounce-averaged quasi-linear momentum ba , pitch-angle ba, and mixed ba diffusion coefficients in a realistic magnetic field model. We assume that electrons are scattered by oblique whistler mode chorus waves with Gaussian distribution of wave power spectral density and wave normal angle outside the plasmasphere. The scattering rates are computed using the full electromagnetic dispersion relation and up to ±5-order harmonic resonances including Landau resonance. The diffusion coefficients are calculated for geomagnetically quiet and disturbed conditions at different MLT locations and distances. We compare bounce-averaged scattering rates in different Tsyganenko models with those in the dipole field and discuss the differences. We focus on electron energies from 10 keV to 10 MeV. Latitudinal distribution of plasma density is also taken into account. The results are followed by a physical explanation of how the magnetic field model can change the bounce-averaged scattering rates. Our study shows that inclusion of bounce-averaging in the realistic ambient magnetic field is crucially important for future modeling of radiation belt dynamics and resonant wave-particle interactions on other planets. When calculating bounce period and bounce-averaged momentum diffusion coefficients we have singularities in mirror points. Most of the codes use approximate methods to avoid singularities. We show the exact method of performing bounce averaging. The inaccuracies of the approximate approach can introduce errors up to an order in magnitude. We also give the new more accurate approximations for particle bounce time in the dipole magnetic field.

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