Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves
Abstract
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.
- Authors:
-
- 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
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1463564
- Report Number(s):
- LA-UR-18-25086
Journal ID: ISSN 0094-8276
- Grant/Contract Number:
- AC52-06NA25396; NNX15AF57G; NNX16AG69G; NAS5-01072; 967399; 921647; NNX17AD36G; NNX17AI55G
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 45; Journal Issue: 5; Journal ID: ISSN 0094-8276
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; radial transport; geomagnetic storms; Alfven waves; radiation belts
Citation Formats
Chaston, C. C., Bonnell, J. W., Wygant, J. R., Reeves, Geoffrey D., Baker, D. N., and Melrose, D. B. Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves. United States: N. p., 2018.
Web. doi:10.1002/2017GL076362.
Chaston, C. C., Bonnell, J. W., Wygant, J. R., Reeves, Geoffrey D., Baker, D. N., & Melrose, D. B. Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves. United States. https://doi.org/10.1002/2017GL076362
Chaston, C. C., Bonnell, J. W., Wygant, J. R., Reeves, Geoffrey D., Baker, D. N., and Melrose, D. B. Sat .
"Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves". United States. https://doi.org/10.1002/2017GL076362. https://www.osti.gov/servlets/purl/1463564.
@article{osti_1463564,
title = {Radiation Belt “Dropouts” and Drift-Bounce Resonances in Broadband Electromagnetic Waves},
author = {Chaston, C. C. and Bonnell, J. W. and Wygant, J. R. and Reeves, Geoffrey D. and Baker, D. N. and Melrose, D. B.},
abstractNote = {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.},
doi = {10.1002/2017GL076362},
journal = {Geophysical Research Letters},
number = 5,
volume = 45,
place = {United States},
year = {Sat Mar 03 00:00:00 EST 2018},
month = {Sat Mar 03 00:00:00 EST 2018}
}
Web of Science
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