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Title: Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region

Abstract

Here, we investigate the gradual diffusion of energetic electrons from the inner edge of the outer radiation belt into the slot region. The Van Allen Probes observed slow inward diffusion and decay of ~200–600 keV electrons following the intense geomagnetic storm that occurred on 17 March 2013. During the 10 day nondisturbed period following the storm, the peak of electron fluxes gradually moved from L ~ 2.7 to L ~ 2.4, and the flux levels decreased by a factor of ~2–4 depending on the electron energy. We simulated the radial intrusion and decay of electrons using a three–dimensional diffusion code, which reproduced the energy–dependent transport of electrons from ~100 keV to 1 MeV in the slot region. At energies of 100–200 keV, the electrons experience fast transport across the slot region due to the dominance of radial diffusion; at energies of 200–600 keV, the electrons gradually diffuse and decay in the slot region due to the comparable rate of radial diffusion and pitch angle scattering by plasmaspheric hiss; at energies of E > 700 keV, the electrons stopped diffusing near the inner edge of outer radiation belt due to the dominant pitch angle scattering loss. In addition to plasmaspheric hiss,more » magnetosonic waves and VLF transmitters can cause the loss of high pitch angle electrons, relaxing the sharp “top–hat” shaped pitch angle distributions created by plasmaspheric hiss. Our simulation indicates the importance of balance between radial diffusion and loss through pitch angle scattering in forming the diffusive intrusion of energetic electrons across the slot region.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of California, Los Angeles, CA (United States); Boston Univ., Boston, MA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of New Hampshire, Durham, NH (United States)
  5. The Aerospace Corp., Los Angeles, CA (United States)
  6. Univ. of Iowa, Iowa City, IA (United States)
  7. Univ. of Colorado, Boulder, CO (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
National Aeronautic and Space Administration (NASA); USDOE
OSTI Identifier:
1440490
Report Number(s):
[LA-UR-17-31421]
[Journal ID: ISSN 2169-9380; TRN: US1900752]
Grant/Contract Number:  
[AC52-06NA25396]
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
[ Journal Volume: 122; Journal Issue: 10]; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics; energetic electron diffusion; electron transport; pitch angle scattering; slot region dynamics; Van Allen Probes observation; waves in plasmasphere

Citation Formats

Ma, Q., Li, W., Thorne, R. M., Bortnik, J., Reeves, G. D., Spence, H. E., Turner, D. L., Blake, J. B., Fennell, J. F., Claudepierre, S. G., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., and Baker, D. N. Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region. United States: N. p., 2017. Web. doi:10.1002/2017JA024452.
Ma, Q., Li, W., Thorne, R. M., Bortnik, J., Reeves, G. D., Spence, H. E., Turner, D. L., Blake, J. B., Fennell, J. F., Claudepierre, S. G., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., & Baker, D. N. Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region. United States. doi:10.1002/2017JA024452.
Ma, Q., Li, W., Thorne, R. M., Bortnik, J., Reeves, G. D., Spence, H. E., Turner, D. L., Blake, J. B., Fennell, J. F., Claudepierre, S. G., Kletzing, C. A., Kurth, W. S., Hospodarsky, G. B., and Baker, D. N. Fri . "Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region". United States. doi:10.1002/2017JA024452. https://www.osti.gov/servlets/purl/1440490.
@article{osti_1440490,
title = {Diffusive Transport of Several Hundred keV Electrons in the Earth's Slot Region},
author = {Ma, Q. and Li, W. and Thorne, R. M. and Bortnik, J. and Reeves, G. D. and Spence, H. E. and Turner, D. L. and Blake, J. B. and Fennell, J. F. and Claudepierre, S. G. and Kletzing, C. A. and Kurth, W. S. and Hospodarsky, G. B. and Baker, D. N.},
abstractNote = {Here, we investigate the gradual diffusion of energetic electrons from the inner edge of the outer radiation belt into the slot region. The Van Allen Probes observed slow inward diffusion and decay of ~200–600 keV electrons following the intense geomagnetic storm that occurred on 17 March 2013. During the 10 day nondisturbed period following the storm, the peak of electron fluxes gradually moved from L ~ 2.7 to L ~ 2.4, and the flux levels decreased by a factor of ~2–4 depending on the electron energy. We simulated the radial intrusion and decay of electrons using a three–dimensional diffusion code, which reproduced the energy–dependent transport of electrons from ~100 keV to 1 MeV in the slot region. At energies of 100–200 keV, the electrons experience fast transport across the slot region due to the dominance of radial diffusion; at energies of 200–600 keV, the electrons gradually diffuse and decay in the slot region due to the comparable rate of radial diffusion and pitch angle scattering by plasmaspheric hiss; at energies of E > 700 keV, the electrons stopped diffusing near the inner edge of outer radiation belt due to the dominant pitch angle scattering loss. In addition to plasmaspheric hiss, magnetosonic waves and VLF transmitters can cause the loss of high pitch angle electrons, relaxing the sharp “top–hat” shaped pitch angle distributions created by plasmaspheric hiss. Our simulation indicates the importance of balance between radial diffusion and loss through pitch angle scattering in forming the diffusive intrusion of energetic electrons across the slot region.},
doi = {10.1002/2017JA024452},
journal = {Journal of Geophysical Research. Space Physics},
number = [10],
volume = [122],
place = {United States},
year = {2017},
month = {9}
}

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