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Modeling the effects of radial diffusion and plasmaspheric hiss on outer radiation belt electrons

Lam, M. M.; Horne, R. B.; Meredith, N. P.; Glauert, S. A.. 2007 Modeling the effects of radial diffusion and plasmaspheric hiss on outer radiation belt electrons. Geophysical Research Letters, 34 (2), L20112. 5, pp. 10.1029/2007GL031598

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Abstract/Summary

We simulate the behaviour of relativistic (976 keV) electrons in the outer radiation belt (3 ≤ L ≤ 7) during the first half of the CRRES mission. We use a 1d radial diffusion model with losses due to pitch-angle scattering by plasmaspheric hiss expressed through the electron lifetime calculated using the PADIE code driven by a global K p -dependent model of plasmaspheric hiss intensity and f pe /f ce . We use a time and energy-dependent outer boundary derived from observations. The model reproduces flux variations to within an order of magnitude for L ≤ 4 suggesting hiss is the dominant cause of electron losses in the plasmasphere near the equator. At L = 5 the model reproduces significant variations but underestimates the size of the variability. We find that during magnetic storms hiss can cause significant losses for L ≤ 6 due to its presence in plumes. Wave acceleration is partially represented by the boundary conditions.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1029/2007GL031598
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Sun Earth Connections
ISSN: 0094-8276
NORA Subject Terms: Physics
Space Sciences
Date made live: 06 Nov 2009 15:48
URI: http://nora.nerc.ac.uk/id/eprint/6838

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