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Journal Articles Annales Geophysicae Year : 2013

Parametric validations of analytical lifetime estimates for radDiisacutsisioonns belt electron diffusion by whistler waves

Abstract

The lifetimes of electrons trapped in Earth's radiation belts can be calculated from quasi-linear pitch-angle diffusion by whistler-mode waves, provided that their frequency spectrum is broad enough and/or their average amplitude is not too large. Extensive comparisons between improved analytical lifetime estimates and full numerical calculations have been performed in a broad parameter range representative of a large part of the magnetosphere from L ~ 2 to 6. The effects of observed very oblique whistler waves are taken into account in both numerical and analytical calculations. Analytical lifetimes (and pitch-angle diffusion coefficients) are found to be in good agreement with full numerical calculations based on CRRES and Cluster hiss and lightning-generated wave measurements inside the plasmasphere and Cluster lower-band chorus waves measurements in the outer belt for electron energies ranging from 100 keV to 5 MeV. Comparisons with lifetimes recently obtained from electron flux measurements on SAMPEX, SCATHA, SAC-C and DEMETER also show reasonable agreement.
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Dates and versions

insu-01174694 , version 1 (09-07-2015)

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A.V. Artemyev, D. Mourenas, O. V. Agapitov, V.V. Krasnoselskikh. Parametric validations of analytical lifetime estimates for radDiisacutsisioonns belt electron diffusion by whistler waves. Annales Geophysicae, 2013, 31, pp.599-624. ⟨10.5194/angeo-31-599-2013⟩. ⟨insu-01174694⟩
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