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Title: Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves

Abstract

A magnetic conjunction between Van Allen Probes spacecraft and the Balloon Array for Radiation-belt Relativistic Electron Losses (BARREL) demonstrates the simultaneous occurrence of broadband Alfvénic fluctuations and multi-timescale modulation of enhanced atmospheric X-ray bremsstrahlung emission. The properties of the Alfvénic fluctuations are utilized to build a model for pitch angle scattering in the outer radiation belt on electron gyro-radii scale field structures. It is observed that this scattering may lead to the transport of electrons into the loss cone over an energy range from hundreds of keV to multi-MeV on diffusive timescales on the order of hours. This process may account for modulation of atmospheric X-ray fluxes observed from balloons and constitute a significant loss process for the radiation belts.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Univ. of California, Berkeley, CA (United States)
  2. Aerospace Corp., Chantilly, VA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Colorado, Boulder, CO (United States)
  5. Univ. of Iowa, Iowa City, IA (United States)
  6. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Aeronautic and Space Administration (NASA); Johns Hopkins University Applied Physics Laboratory (JHU/APL)
OSTI Identifier:
1558051
Report Number(s):
[LA-UR-18-28973]
[Journal ID: ISSN 0094-8276]
Grant/Contract Number:  
[89233218CNA000001]
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
[ Journal Volume: 45; Journal Issue: 18]; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS; Alfven waves; radiation belts; pitch angle scattering; drift‐bounce resonance; geomagnetic storms; energetic particles

Citation Formats

Chaston, C. C., Bonnell, J. W., Halford, A. J., Reeves, Geoffrey D., Baker, D. N., Kletzing, C. A., and Wygant, J. R. Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves. United States: N. p., 2018. Web. doi:10.1029/2018GL079527.
Chaston, C. C., Bonnell, J. W., Halford, A. J., Reeves, Geoffrey D., Baker, D. N., Kletzing, C. A., & Wygant, J. R. Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves. United States. doi:10.1029/2018GL079527.
Chaston, C. C., Bonnell, J. W., Halford, A. J., Reeves, Geoffrey D., Baker, D. N., Kletzing, C. A., and Wygant, J. R. Wed . "Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves". United States. doi:10.1029/2018GL079527. https://www.osti.gov/servlets/purl/1558051.
@article{osti_1558051,
title = {Pitch Angle Scattering and Loss of Radiation Belt Electrons in Broadband Electromagnetic Waves},
author = {Chaston, C. C. and Bonnell, J. W. and Halford, A. J. and Reeves, Geoffrey D. and Baker, D. N. and Kletzing, C. A. and Wygant, J. R.},
abstractNote = {A magnetic conjunction between Van Allen Probes spacecraft and the Balloon Array for Radiation-belt Relativistic Electron Losses (BARREL) demonstrates the simultaneous occurrence of broadband Alfvénic fluctuations and multi-timescale modulation of enhanced atmospheric X-ray bremsstrahlung emission. The properties of the Alfvénic fluctuations are utilized to build a model for pitch angle scattering in the outer radiation belt on electron gyro-radii scale field structures. It is observed that this scattering may lead to the transport of electrons into the loss cone over an energy range from hundreds of keV to multi-MeV on diffusive timescales on the order of hours. This process may account for modulation of atmospheric X-ray fluxes observed from balloons and constitute a significant loss process for the radiation belts.},
doi = {10.1029/2018GL079527},
journal = {Geophysical Research Letters},
number = [18],
volume = [45],
place = {United States},
year = {2018},
month = {9}
}

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