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Title: 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:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  2. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics and Astronomy
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  5. Univ. of Sydney, Camperdown, NSW (Australia). School of Physics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic 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:
Journal Article: 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. doi: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. doi:10.1002/2017GL076362.
@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}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 3, 2019
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