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Title: Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D

Abstract

Our study focused on understanding the coupling between different electron populations in the inner magnetosphere and the various physical processes that determine evolution of electron fluxes at different energies. Observations during the 17 March 2013 storm and simulations with a newly developed Versatile Electron Radiation Belt-4D (VERB-4D) are presented. This analysis of the drift trajectories of the energetic and relativistic electrons shows that electron trajectories at transitional energies with a first invariant on the scale of ~100 MeV/G may resemble ring current or relativistic electron trajectories depending on the level of geomagnetic activity. Simulations with the VERB-4D code including convection, radial diffusion, and energy diffusion are presented. Sensitivity simulations including various physical processes show how different acceleration mechanisms contribute to the energization of energetic electrons at transitional energies. In particular, the range of energies where inward transport is strongly influenced by both convection and radial diffusion are studied. Our results of the 4-D simulations are compared to Van Allen Probes observations at a range of energies including source, seed, and core populations of the energetic and relativistic electrons in the inner magnetosphere.

Authors:
 [1];  [2];  [2];  [3]; ORCiD logo [4];  [5]
  1. Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Planetary, and Space Sciences; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Earth Atmospheric and Planetary Sciences
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Planetary, and Space Sciences
  3. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Colorado, Boulder, CO (United States). Lab. of Atmospheric and Space Physics
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1335610
Report Number(s):
LA-UR-15-28236
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 22; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Heliospheric and Magnetospheric Physics

Citation Formats

Shprits, Yuri Y., Kellerman, Adam C., Drozdov, Alexander Y., Spence, Harlan E., Reeves, Geoffrey D., and Baker, Daniel N. Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D. United States: N. p., 2015. Web. doi:10.1002/2015GL065230.
Shprits, Yuri Y., Kellerman, Adam C., Drozdov, Alexander Y., Spence, Harlan E., Reeves, Geoffrey D., & Baker, Daniel N. Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D. United States. doi:10.1002/2015GL065230.
Shprits, Yuri Y., Kellerman, Adam C., Drozdov, Alexander Y., Spence, Harlan E., Reeves, Geoffrey D., and Baker, Daniel N. Thu . "Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D". United States. doi:10.1002/2015GL065230. https://www.osti.gov/servlets/purl/1335610.
@article{osti_1335610,
title = {Combined convective and diffusive simulations: VERB-4D comparison with 17 March 2013 Van Allen Probes observations: VERB-4D},
author = {Shprits, Yuri Y. and Kellerman, Adam C. and Drozdov, Alexander Y. and Spence, Harlan E. and Reeves, Geoffrey D. and Baker, Daniel N.},
abstractNote = {Our study focused on understanding the coupling between different electron populations in the inner magnetosphere and the various physical processes that determine evolution of electron fluxes at different energies. Observations during the 17 March 2013 storm and simulations with a newly developed Versatile Electron Radiation Belt-4D (VERB-4D) are presented. This analysis of the drift trajectories of the energetic and relativistic electrons shows that electron trajectories at transitional energies with a first invariant on the scale of ~100 MeV/G may resemble ring current or relativistic electron trajectories depending on the level of geomagnetic activity. Simulations with the VERB-4D code including convection, radial diffusion, and energy diffusion are presented. Sensitivity simulations including various physical processes show how different acceleration mechanisms contribute to the energization of energetic electrons at transitional energies. In particular, the range of energies where inward transport is strongly influenced by both convection and radial diffusion are studied. Our results of the 4-D simulations are compared to Van Allen Probes observations at a range of energies including source, seed, and core populations of the energetic and relativistic electrons in the inner magnetosphere.},
doi = {10.1002/2015GL065230},
journal = {Geophysical Research Letters},
number = 22,
volume = 42,
place = {United States},
year = {2015},
month = {11}
}

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