Radial transport of radiation belt electrons in kinetic field-line resonances

Chaston, Christopher C.; Bonnell, J. W.; Wygant, J. R.; Reeves, Geoffrey D.; Baker, D. N.; Melrose, D. B.; Cairns, Iver H.

doi:10.1002/2017GL074587

Title: Radial transport of radiation belt electrons in kinetic field-line resonances

Journal Article · Tue Jul 25 00:00:00 EDT 2017 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL074587· OSTI ID:1402654

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Univ. of California, Berkeley, CA (United States)
Univ. of Minnesota, Minneapolis MN (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. of Sydney, Camperdown New South Wales (Australia)

A representative case study from the Van Allen Probes during a geomagnetic storm recovery phase reveals enhanced electron fluxes at intermediate pitch angles over energies from ~100 keV to 5 MeV coincident with broadband low-frequency electromagnetic waves. The statistical properties of these waves are used to build a model for radial diffusion via drift-bounce resonances in kinetic Alfvén eigenmodes/kinetic field-line resonances. Estimated diffusion coefficients indicate timescales for radial transport on the order of hours in storm time events at energies from <100 keV to MeVs over equatorial pitch angles from the edge of the loss cone to nearly perpendicular to the geomagnetic field. In conclusion, the correlation of kinetic resonances with electron depletions and enhancements during storm main phase and recovery, and the rapid diffusion these waves drive, suggests that they may modulate the outer radiation belt.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1402654

Report Number(s):: LA-UR-17-28035; TRN: US1702889

Journal Information:: Geophysical Research Letters, Vol. 44, Issue 16; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Earth's Van Allen Radiation Belts: From Discovery to the Van Allen Probes Era Li, W.; Hudson, M. K. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 11 https://doi.org/10.1029/2018ja025940	journal	November 2019
Impact of Significant Time‐Integrated Geomagnetic Activity on 2‐MeV Electron Flux Mourenas, D.; Artemyev, A. V.; Zhang, X. ‐J. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 6 https://doi.org/10.1029/2019ja026659	journal	June 2019

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