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Title: Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt

Abstract

The radial and local diffusion processes induced by various plasma waves govern the highly energetic electron dynamics in the Earth's radiation belts, causing distinct characteristics in electron distributions at various energies. In this study, we present our simulation results of the energetic electron evolution during a geomagnetic storm using the University of California, Los Angeles 3-D diffusion code. Following the plasma sheet electron injections, the electrons at different energy bands detected by the Magnetic Electron Ion Spectrometer (MagEIS) and Relativistic Electron Proton Telescope (REPT) instruments on board the Van Allen Probes exhibit a rapid enhancement followed by a slow diffusive movement in differential energy fluxes, and the radial extent to which electrons can penetrate into depends on energy with closer penetration toward the Earth at lower energies than higher energies. We incorporate radial diffusion, local acceleration, and loss processes due to whistler mode wave observations to perform a 3-D diffusion simulation. Here, our simulation results demonstrate that chorus waves cause electron flux increase by more than 1 order of magnitude during the first 18 h, and the subsequent radial extents of the energetic electrons during the storm recovery phase are determined by the coupled radial diffusion and the pitch anglemore » scattering by EMIC waves and plasmaspheric hiss. The radial diffusion caused by ULF waves and local plasma wave scattering are energy dependent, which lead to the observed electron flux variations with energy dependences. Lastly, this study suggests that plasma wave distributions in the inner magnetosphere are crucial for the energy-dependent intrusions of several hundred keV to several MeV electrons.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2]; ORCiD logo [3];  [4];  [4];  [4];  [3];  [5];  [6];  [7];  [7];  [8]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences; Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics/Earth, Planetary and Space Sciences
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  5. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  6. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  7. Aerospace Corporation, Los Angeles, CA (United States)
  8. Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics/Earth, Planetary and Space Sciences
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE
OSTI Identifier:
1402607
Report Number(s):
LA-UR-16-22083
Journal ID: ISSN 2169-9380; TRN: US1703005
Grant/Contract Number:  
AC52-06NA25396; 967399; 921647; NAS5-01072; FA9550-15-1-0158; NNX15AI96G; NNX15AF61G; NNX11AR64G; NNX13AI61G; NNX14AI18G; 1405054; 1451911
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 5; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 58 GEOSCIENCES; Heliospheric and Magnetospheric Physics; energy-dependent diffusion; radiation belt simulation; electron acceleration and loss; radial diffusion

Citation Formats

Ma, Q., Li, W., Thorne, R. M., Nishimura, Y., Zhang, X. -J., Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Henderson, M. G., Spence, H. E., Baker, D. N., Blake, J. B., Fennell, J. F., and Angelopoulos, V. Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt. United States: N. p., 2016. Web. doi:10.1002/2016JA022507.
Ma, Q., Li, W., Thorne, R. M., Nishimura, Y., Zhang, X. -J., Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Henderson, M. G., Spence, H. E., Baker, D. N., Blake, J. B., Fennell, J. F., & Angelopoulos, V. Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt. United States. doi:10.1002/2016JA022507.
Ma, Q., Li, W., Thorne, R. M., Nishimura, Y., Zhang, X. -J., Reeves, Geoffrey D., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., Henderson, M. G., Spence, H. E., Baker, D. N., Blake, J. B., Fennell, J. F., and Angelopoulos, V. Thu . "Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt". United States. doi:10.1002/2016JA022507. https://www.osti.gov/servlets/purl/1402607.
@article{osti_1402607,
title = {Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt},
author = {Ma, Q. and Li, W. and Thorne, R. M. and Nishimura, Y. and Zhang, X. -J. and Reeves, Geoffrey D. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Henderson, M. G. and Spence, H. E. and Baker, D. N. and Blake, J. B. and Fennell, J. F. and Angelopoulos, V.},
abstractNote = {The radial and local diffusion processes induced by various plasma waves govern the highly energetic electron dynamics in the Earth's radiation belts, causing distinct characteristics in electron distributions at various energies. In this study, we present our simulation results of the energetic electron evolution during a geomagnetic storm using the University of California, Los Angeles 3-D diffusion code. Following the plasma sheet electron injections, the electrons at different energy bands detected by the Magnetic Electron Ion Spectrometer (MagEIS) and Relativistic Electron Proton Telescope (REPT) instruments on board the Van Allen Probes exhibit a rapid enhancement followed by a slow diffusive movement in differential energy fluxes, and the radial extent to which electrons can penetrate into depends on energy with closer penetration toward the Earth at lower energies than higher energies. We incorporate radial diffusion, local acceleration, and loss processes due to whistler mode wave observations to perform a 3-D diffusion simulation. Here, our simulation results demonstrate that chorus waves cause electron flux increase by more than 1 order of magnitude during the first 18 h, and the subsequent radial extents of the energetic electrons during the storm recovery phase are determined by the coupled radial diffusion and the pitch angle scattering by EMIC waves and plasmaspheric hiss. The radial diffusion caused by ULF waves and local plasma wave scattering are energy dependent, which lead to the observed electron flux variations with energy dependences. Lastly, this study suggests that plasma wave distributions in the inner magnetosphere are crucial for the energy-dependent intrusions of several hundred keV to several MeV electrons.},
doi = {10.1002/2016JA022507},
journal = {Journal of Geophysical Research. Space Physics},
number = 5,
volume = 121,
place = {United States},
year = {2016},
month = {4}
}

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Cited by: 14 works
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    Works referencing / citing this record:

    Long-term evolution of electron distribution function due to nonlinear resonant interaction with whistler mode waves
    journal, April 2018

    • Artemyev, Anton V.; Neishtadt, Anatoly I.; Vasiliev, Alexei A.
    • Journal of Plasma Physics, Vol. 84, Issue 2
    • DOI: 10.1017/s0022377818000260

    Long-term evolution of electron distribution function due to nonlinear resonant interaction with whistler mode waves
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    • Artemyev, Anton V.; Neishtadt, Anatoly I.; Vasiliev, Alexei A.
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