Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves

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

doi:10.1002/2017GL076362

Title: Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves

Journal Article · Sat Mar 03 00:00:00 EST 2018 · Geophysical Research Letters

DOI:https://doi.org/10.1002/2017GL076362· OSTI ID:1463564

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Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics and Astronomy
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
Univ. of Sydney, Camperdown, NSW (Australia). School of Physics

Observations during the main phase of geomagnetic storms reveal an anticorrelation between the occurrence of broadband low-frequency electromagnetic waves and outer radiation belt electron flux. Here, we show that the drift-bounce motion of electrons in the magnetic field of these waves leads to rapid electron transport. For observed spectral energy densities it is demonstrated that the wave magnetic field can drive radial diffusion via drift-bounce resonance on time scales less than a drift orbit. This process may provide outward transport sufficient to account for electron “dropouts” during storm main phase and more generally modulate the outer radiation belt during geomagnetic storms.

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

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

Grant/Contract Number:: AC52-06NA25396; NNX15AF57G; NNX16AG69G; NAS5-01072; 967399; 921647; NNX17AD36G; NNX17AI55G

OSTI ID:: 1463564

Report Number(s):: LA-UR-18-25086

Journal Information:: Geophysical Research Letters, Vol. 45, Issue 5; ISSN 0094-8276

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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58 GEOSCIENCES
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