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

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.

doi:10.1002/2016JA022507

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

Journal Article · 28 April 2016 · Journal of Geophysical Research. Space Physics

DOI: https://doi.org/10.1002/2016JA022507 · OSTI ID:1402607

^[1]; Li, W. ^[1]; Thorne, R. M. ^[1]; Nishimura, Y. ^[1]; Zhang, X. -J. ^[2];

^[3]; Kletzing, C. A. ^[4]; Kurth, W. S. ^[4]; Hospodarsky, G. B. ^[4]; Henderson, M. G. ^[3]; Spence, H. E. ^[5]; Baker, D. N. ^[6]; Blake, J. B. ^[7]; Fennell, J. F. ^[7]; Angelopoulos, V. ^[8]

Univ. of California, Los Angeles, CA (United States). Dept. of Atmospheric and Oceanic Sciences
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
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
Aerospace Corporation, Los Angeles, CA (United States)
Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics/Earth, Planetary and Space Sciences

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.

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

Sponsoring Organization:: National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC52-06NA25396; 967399; 921647; NAS5-01072; FA9550-15-1-0158; NNX15AI96G; NNX15AF61G; NNX11AR64G; NNX13AI61G; NNX14AI18G; 1405054; 1451911

OSTI ID:: 1402607

Report Number(s):: LA-UR-16-22083; TRN: US1703005

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 121, Issue 5; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Equatorial Magnetosonic Waves Observed by Cluster Satellites: The Chirikov Resonance Overlap Criterion Aryan, Homayon; Walker, Simon N.; Balikhin, Michael A. Journal of Geophysical Research: Space Physics, Vol. 124, Issue 4 https://doi.org/10.1029/2019ja026680	journal	April 2019
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Explaining the apparent impenetrable barrier to ultra-relativistic electrons in the outer Van Allen belt Ozeke, Louis G.; Mann, Ian R.; Murphy, Kyle R. Nature Communications, Vol. 9, Issue 1 https://doi.org/10.1038/s41467-018-04162-3	journal	May 2018
From solar sneezing to killer electrons: outer radiation belt response to solar eruptions Daglis, Ioannis A.; Katsavrias, Christos; Georgiou, Marina Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2148 https://doi.org/10.1098/rsta.2018.0097	journal	May 2019
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Title: Simulation of energy-dependent electron diffusion processes in the Earth's outer radiation belt

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