Evolution of plasma sheet electron pitch angle distribution by whistler-mode chorus waves in non-dipole magnetic fields: Comparisons with the use of dipole model

Details Evolution of plasma sheet electron pitch angle distribution by whistler-mode chorus waves in non-dipole magnetic fields: Comparisons with the use of dipole model Evolution of plasma sheet electron pitch angle distribution by whistler-mode chorus waves in non-dipole magnetic fields: Comparisons with the use of dipole model

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2040m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2040

Physics

Plasma Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2774] Magnetospheric Physics / Radiation Belts, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

We present a detailed numerical study on the effects of non-dipole magnetic field on Earth's plasma sheet electron distribution and its implication for diffuse auroral precipitation. Use of the modified bounce-averaged Fokker-Planck equation for 2-D non-dipole magnetic fields suggests that we can follow the numerical schemes used for a dipole field but should evaluate bounce-averaged diffusion coefficients and bounce period related terms in non-dipole magnetic fields. Focusing on nightside whistler-mode chorus waves at L=6 within the Dungey magnetic models, we calculate and make comparison of the bounce-averaged diffusion coefficients in each case. Adoption of the Alternative Direction Implicit scheme to numerically solve 2-D Fokker-Planck diffusion equation gives the result that chorus driven resonant scattering diffuses the plasma sheet electrons much faster into loss cone and also expands to lower energies and higher equatorial pitch angles when the southward interplanetary magnetic field increases in the Dungey magnetic model. Furthermore, we find that changes in diffusion coefficients are the dominant factor responsible for variations in modeled temporal evolution of plasma sheet electron distribution. Our study demonstrates that the effects of realistic ambient magnetic fields are required to be incorporated into both evaluation of resonant diffusion coefficients and calculation of Fokker-Planck diffusion equation to quantitatively understand the evolution of plasma sheet electron distribution and the occurrence of diffuse aurora, in particular at L>5 during geomagnetically disturbed periods when the ambient magnetic field considerably deviates from a magnetic dipole.

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