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Title: Statistical properties of the radiation belt seed population

Abstract

Here, we present a statistical analysis of phase space density data from the first 26 months of the Van Allen Probes mission. In particular, we investigate the relationship between the tens and hundreds of keV seed electrons and >1 MeV core radiation belt electron population. Using a cross-correlation analysis, we find that the seed and core populations are well correlated with a coefficient of ≈0.73 with a time lag of 10–15 h. We present evidence of a seed population threshold that is necessary for subsequent acceleration. The depth of penetration of the seed population determines the inner boundary of the acceleration process. However, we show that an enhanced seed population alone is not enough to produce acceleration in the higher energies, implying that the seed population of hundreds of keV electrons is only one of several conditions required for MeV electron radiation belt acceleration.

Authors:
 [1];  [2];  [2]; ORCiD logo [3];  [4];  [5];  [5];  [5];  [5];  [6]
  1. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space; New Mexico Consortium, Los Alamos, NM (United States)
  2. Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
  3. New Mexico Consortium, Los Alamos, NM (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
  5. Aerospace Corporation, El Segundo, CA (United States). Space Sciences Dept.
  6. 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; Univ. of Potsdam (Germany). Helmholtz Centre Potsdam, German Research Centre For Geosciences (GFZ)
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:
1402613
Report Number(s):
LA-UR-16-23144
Journal ID: ISSN 2169-9380; TRN: US1703010
Grant/Contract Number:
AC52-06NA25396; NAS5-01072
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 121; Journal Issue: 8; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; Heliospheric and Magnetospheric Physics; radiation belt; seed population; phase space density

Citation Formats

Boyd, A. J., Spence, H. E., Huang, C. -L., Reeves, G. D., Baker, D. N., Turner, D. L., Claudepierre, S. G., Fennell, J. F., Blake, J. B., and Shprits, Y. Y. Statistical properties of the radiation belt seed population. United States: N. p., 2016. Web. doi:10.1002/2016JA022652.
Boyd, A. J., Spence, H. E., Huang, C. -L., Reeves, G. D., Baker, D. N., Turner, D. L., Claudepierre, S. G., Fennell, J. F., Blake, J. B., & Shprits, Y. Y. Statistical properties of the radiation belt seed population. United States. doi:10.1002/2016JA022652.
Boyd, A. J., Spence, H. E., Huang, C. -L., Reeves, G. D., Baker, D. N., Turner, D. L., Claudepierre, S. G., Fennell, J. F., Blake, J. B., and Shprits, Y. Y. Mon . "Statistical properties of the radiation belt seed population". United States. doi:10.1002/2016JA022652. https://www.osti.gov/servlets/purl/1402613.
@article{osti_1402613,
title = {Statistical properties of the radiation belt seed population},
author = {Boyd, A. J. and Spence, H. E. and Huang, C. -L. and Reeves, G. D. and Baker, D. N. and Turner, D. L. and Claudepierre, S. G. and Fennell, J. F. and Blake, J. B. and Shprits, Y. Y.},
abstractNote = {Here, we present a statistical analysis of phase space density data from the first 26 months of the Van Allen Probes mission. In particular, we investigate the relationship between the tens and hundreds of keV seed electrons and >1 MeV core radiation belt electron population. Using a cross-correlation analysis, we find that the seed and core populations are well correlated with a coefficient of ≈0.73 with a time lag of 10–15 h. We present evidence of a seed population threshold that is necessary for subsequent acceleration. The depth of penetration of the seed population determines the inner boundary of the acceleration process. However, we show that an enhanced seed population alone is not enough to produce acceleration in the higher energies, implying that the seed population of hundreds of keV electrons is only one of several conditions required for MeV electron radiation belt acceleration.},
doi = {10.1002/2016JA022652},
journal = {Journal of Geophysical Research. Space Physics},
number = 8,
volume = 121,
place = {United States},
year = {Mon Jul 25 00:00:00 EDT 2016},
month = {Mon Jul 25 00:00:00 EDT 2016}
}

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