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

Albert, J.M.; Meredith, N.P. ORCID: https://orcid.org/0000-0001-5032-3463; Horne, R.B. ORCID: https://orcid.org/0000-0002-0412-6407. 2009 Three-dimensional diffusion simulation of outer radiation belt electrons during the 9 October 1990 magnetic storm. Journal of Geophysical Research, 114 (A9), A09214. 21, pp. https://doi.org/10.1029/2009JA014336

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2009JA014336
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Sun Earth Connections
ISSN:	0148-0227
Additional Keywords:	radiation belts, chorus waves, diffusion
NORA Subject Terms:	Space Sciences
Date made live:	10 Feb 2010 16:03 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/8371

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