Ion radial diffusion in an electrostatic impulse model for stormtime ring current formation

Details Ion radial diffusion in an electrostatic impulse model for stormtime ring current formation Ion radial diffusion in an electrostatic impulse model for stormtime ring current formation

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..621c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 20, 1992, p. 621-624.

Physics

16

Diffusion Coefficient, Magnetic Storms, Particle Trajectories, Radiation Belts, Ring Currents, Charged Particles, Earth Magnetosphere, Magnetic Field Configurations, Mathematical Models, Transport Theory

Scientific paper

Two refinements to the quasi-linear theory of ion radial diffusion are proposed and examined analytically with simulations of particle trajectories. The resonance-broadening correction by Dungey (1965) is applied to the quasi-linear diffusion theory by Faelthammar (1965) for an individual model storm. Quasi-linear theory is then applied to the mean diffusion coefficients resulting from simulations of particle trajectories in 20 model storms. The correction for drift-resonance broadening results in quasi-linear diffusion coefficients with discrepancies from the corresponding simulated values that are reduced by a factor of about 3. Further reductions in the discrepancies are noted following the averaging of the quasi-linear diffusion coefficients, the simulated coefficients, and the resonance-broadened coefficients for the 20 storms. Quasi-linear theory provides good descriptions of particle transport for a single storm but performs even better in conjunction with the present ensemble-averaging.

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