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Simulations of Van Allen Probes Plasmaspheric Electron Density Observations

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2018JA025776· OSTI ID:1483537
 [1];  [2];  [3];  [1];  [1];  [4];  [4]
  1. Univ. of Iowa, Iowa City, IA (United States). Dept. of Physics and Astronomy
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Southwest Research Inst. (SwRI), San Antonio, TX (United States)
  4. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy
+ Show Author Affiliations
Here we simulate equatorial plasmaspheric electron densities using a physics-based model (Cold PLasma, CPL; used in the ring current-atmosphere interactions model) of the source and loss processes of refilling and erosion driven by empirical inputs. The performance of CPL is evaluated against in situ measurements by the Van Allen Probes (Radiation Belt Storm Probes) for two events: the 31 May to 5 June and 15 to 20 January 2013 geomagnetic storms observed in the premidnight and postmidnight magnetic local time (MLT) sectors, respectively. Overall, CPL reproduces the radial extent of the plasmasphere to within a mean absolute difference of |ΔLavg|=0.5 ± 0.1 L. The model electric field responsible for E × B convection and the parameterization of geomagnetic conditions (under the Kp-index and solar wind properties) implemented by CPL did not account for localized enhancements in the duskward electric field during increased activity. Rather, it was found to be largely dependent on the measure of the quiet time background. Finally, this property indicates that the agreement between these simulations and observations does not account for the complete set of physical processes during extreme (strong or weak) geomagnetic conditions impacting the plasmasphere. Nevertheless, at the presented resolution of the model CPL does provide good agreement in reproducing Radiation Belt Storm Probes observations of plasmaspheric density and plasmapause location.
Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Aeronautics and Space Administration (NASA) (United States); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1483537
Alternate ID(s):
OSTI ID: 1673372
Report Number(s):
LA-UR--18-25524; LA-UR--20-24438
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 11 Vol. 123; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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