Bounce-averaged diffusion coefficients in non-dipole field for field-aligned chorus waves

Details Bounce-averaged diffusion coefficients in non-dipole field for field-aligned chorus waves Bounce-averaged diffusion coefficients in non-dipole field for field-aligned chorus waves

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1578o&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1578

Physics

[2720] Magnetospheric Physics / Energetic Particles: Trapped, [2774] Magnetospheric Physics / Radiation Belts

Scientific paper

Scattering rates calculated in a dipole field are used in radiation belt codes. We present the results of calculations of the bounce-averaged quasi-linear diffusion coefficients in momentum Dpp, pitch-angle Dαα and mixed pitch angle-momentum Dαp for field lines (at different distances and MLT) in two non-dipole fields: the Dungey field and the Tsyganenko 89 (T89c) magnetic field. In the T89c field the coefficients were computed for quiet conditions (Kp=2) and storm-time conditions (Kp=6). To calculate diffusion coefficients, we assume that electrons are scattered by the field aligned chorus waves (of Gaussian spectrum) outside the plasmasphere. These waves are observed for MLT between approximately 0 and 12. We also take into consideration the maximum latitude where waves are assumed to be present. We compare calculations of bounce-averaged diffusion coefficients in non-dipole fields with those in the dipole field and discuss the differences. We demonstrate that the effect of bounce averaging in a non-dipole field is negligible at L-shells less than 4, at higher L-shells changes in the field may dramatically alter the scattering rates.

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