Three-dimensional diffusion simulation of outer radiation belt electrons during the 9 October 1990 magnetic storm

Details Three-dimensional diffusion simulation of outer radiation belt electrons during the 9 October 1990 magnetic storm Three-dimensional diffusion simulation of outer radiation belt electrons during the 9 October 1990 magnetic storm

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11409214a&link_type=abstract

Journal of Geophysical Research, Volume 114, Issue A9, CiteID A09214

Physics

25

Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Magnetosphere: Inner, Space Weather: Space Radiation Environment, Space Weather: Magnetic Storms (2788), Magnetospheric Physics: Numerical Modeling

Scientific paper

Relativistic (>1 MeV) electron flux increases in the Earth's radiation belts are significantly underestimated by models that only include transport and loss processes, suggesting that some additional acceleration process is required. Here we use a new, three-dimensional code that includes radial diffusion and quasi-linear pitch angle and energy diffusion due to chorus waves, including cross terms, to simulate the 9 October 1990 magnetic storm. The diffusion coefficients are activity dependent, and time-dependent boundary conditions are imposed on all six boundary faces, taken from fits to CRRES Medium Electrons A electron data. Although the main phase dropout is not fully captured, the persistent phase space density peaks observed during the recovery phase are well explained, but this requires both chorus wave acceleration and radial diffusion.

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