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

Lam, M.M. ORCID: https://orcid.org/0000-0002-0274-6119; Horne, R.B. ORCID: https://orcid.org/0000-0002-0412-6407; Meredith, N.P. ORCID: https://orcid.org/0000-0001-5032-3463; Glauert, S.A. ORCID: https://orcid.org/0000-0003-0149-8608. 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 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/6838

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