Driving ionospheric outflows and magnetospheric O+ energy density with Alfvén waves

Chaston, C. C.; Bonnell, J. W.; Reeves, Geoffrey D.; Skoug, R. M.

doi:10.1002/2016GL069008

Driving ionospheric outflows and magnetospheric O⁺ energy density with Alfvén waves

Journal Article · Wed May 11 00:00:00 EDT 2016 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2016GL069008· OSTI ID:1402612

Chaston, C. C. ^[1]; Bonnell, J. W. ^[2]; ^[3]; Skoug, R. M. ^[4]

Univ. of California, Berkeley, CA (United States). Space Sciences Lab.; Univ. of Sydney, NSW (Australia). School of Physics
Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States). Space Sciences Division
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We show how dispersive Alfvén waves observed in the inner magnetosphere during geomagnetic storms can extract O⁺ ions from the topside ionosphere and accelerate these ions to energies exceeding 50 keV in the equatorial plane. This occurs through wave trapping, a variant of “shock” surfing, and stochastic ion acceleration. These processes in combination with the mirror force drive field-aligned beams of outflowing ionospheric ions into the equatorial plane that evolve to provide energetic O⁺ distributions trapped near the equator. These waves also accelerate preexisting/injected ion populations on the same field lines. We show that the action of dispersive Alfvén waves over several minutes may drive order of magnitude increases in O⁺ ion pressure to make substantial contributions to magnetospheric ion energy density. These wave accelerated ions will enhance the ring current and play a role in the storm time evolution of the magnetosphere.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1402612

Report Number(s):: LA-UR--16-23143

Journal Information:: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 10 Vol. 43; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Radial transport of radiation belt electrons in kinetic field-line resonances: Alfvénic Radiation Belt Transport Chaston, C. C.; Bonnell, J. W.; Wygant, J. R. Geophysical Research Letters, Vol. 44, Issue 16 https://doi.org/10.1002/2017gl074587	journal	August 2017
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Magnetic Field Dipolarization and Its Associated Ion Flux Variations in the Dawnside Deep Inner Magnetosphere: Arase Observations Nosé, M.; Matsuoka, A.; Kasahara, S. Geophysical Research Letters, Vol. 45, Issue 16 https://doi.org/10.1029/2018gl078825	journal	August 2018
Ion Energies Dominating Energy Density in the Inner Magnetosphere: Spatial Distributions and Composition, Observed by Arase/MEP‐i Keika, K.; Kasahara, S.; Yokota, S. Geophysical Research Letters, Vol. 45, Issue 22 https://doi.org/10.1029/2018gl080047	journal	November 2018
Low‐Energy (+ Ion Outflow Directly Into the Inner Magnetosphere: Van Allen Probes Observations Gkioulidou, Matina; Ohtani, S.; Ukhorskiy, A. Y. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 1 https://doi.org/10.1029/2018ja025862	journal	January 2019
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Related Subjects

58 GEOSCIENCES
Alfvén waves
Heliospheric and Magnetospheric Physics
ion acceleration
ionosphere
ionospheric outflow
ring current