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Title: Temperature Dependence of Plasmaspheric Ion Composition

Abstract

We assess a database of Dynamics Explorer-1 (DE-1) Retarding Ion Mass Spectrometer densities and temperatures to yield the first explicit measure of how cold ion concentration depends on temperature. We discover that cold H+ and He+ concentrations have very weak dependence on temperature, but cold O+ ion concentration increases steeply as these ions become warmer. We exhibit how this result can aid in analyzing composition data from other satellites without spacecraft potential mitigation, by applying the result to an example using data from the Van Allen Probes mission. Measurement of light ion concentrations above 1 electron volt (eV) are a reasonable proxy for the concentrations of colder (eV) ions. Warmer O+ ion concentrations may be extrapolated to colder temperatures using our fit to the statistical distribution versus temperature.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [7];  [7];  [8]
+ Show Author Affiliations
  1. Southwest Research Inst. (SwRI), San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
  2. NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)
  3. Univ. of Alabama in Huntsville, AL (United States)
  4. Univ. of New Hampshire, Durham, NH (United States)
  5. Univ. of Iowa, Iowa City, IA (United States)
  6. Univ. of Minnesota, Minneapolis, MN (United States)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Southwest Research Institute (SWRI); NASA Van Allen Probes mission
OSTI Identifier:
1558079
Report Number(s):
LA-UR-19-28103
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 8; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS; plasmasphere; ion; composition; temperature

Citation Formats

Goldstein, J., Gallagher, D., Craven, P. D., Comfort, R. H., Genestreti, K. J., Mouikis, C., Spence, H., Kurth, W., Wygant, J., Skoug, R. M., Larsen, B. A., D. Reeves, G., and De Pascuale, S. Temperature Dependence of Plasmaspheric Ion Composition. United States: N. p., 2019. Web. doi:10.1029/2019JA026822.
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Goldstein, J., Gallagher, D., Craven, P. D., Comfort, R. H., Genestreti, K. J., Mouikis, C., Spence, H., Kurth, W., Wygant, J., Skoug, R. M., Larsen, B. A., D. Reeves, G., & De Pascuale, S. Temperature Dependence of Plasmaspheric Ion Composition. United States. https://doi.org/10.1029/2019JA026822
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Goldstein, J., Gallagher, D., Craven, P. D., Comfort, R. H., Genestreti, K. J., Mouikis, C., Spence, H., Kurth, W., Wygant, J., Skoug, R. M., Larsen, B. A., D. Reeves, G., and De Pascuale, S. Sat . "Temperature Dependence of Plasmaspheric Ion Composition". United States. https://doi.org/10.1029/2019JA026822. https://www.osti.gov/servlets/purl/1558079.
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@article{osti_1558079,
title = {Temperature Dependence of Plasmaspheric Ion Composition},
author = {Goldstein, J. and Gallagher, D. and Craven, P. D. and Comfort, R. H. and Genestreti, K. J. and Mouikis, C. and Spence, H. and Kurth, W. and Wygant, J. and Skoug, R. M. and Larsen, B. A. and D. Reeves, G. and De Pascuale, S.},
abstractNote = {We assess a database of Dynamics Explorer-1 (DE-1) Retarding Ion Mass Spectrometer densities and temperatures to yield the first explicit measure of how cold ion concentration depends on temperature. We discover that cold H+ and He+ concentrations have very weak dependence on temperature, but cold O+ ion concentration increases steeply as these ions become warmer. We exhibit how this result can aid in analyzing composition data from other satellites without spacecraft potential mitigation, by applying the result to an example using data from the Van Allen Probes mission. Measurement of light ion concentrations above 1 electron volt (eV) are a reasonable proxy for the concentrations of colder (eV) ions. Warmer O+ ion concentrations may be extrapolated to colder temperatures using our fit to the statistical distribution versus temperature.},
doi = {10.1029/2019JA026822},
journal = {Journal of Geophysical Research. Space Physics},
number = 8,
volume = 124,
place = {United States},
year = {Sat Jul 20 00:00:00 EDT 2019},
month = {Sat Jul 20 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1029/2019JA026822
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Citation Metrics:
Cited by: 15 works
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Figures / Tables:

Figure 1 Figure 1: Statistical distributions of ion density, temperature, and composition ratio. Previous similar results labeled at bottom of each panel according to legend at the bottom. (a–c) Two-dimensional histograms (samples per bin) versus density and L for H+, He+, and O+. Color bars in lower left corner. Thick black lines givemore » per-L median and standard deviations. Bin dimensions: [ΔL x Δlog10ni] x [0.25 x 0.1]. (d, e, f) 2D histograms versus temperature and L. Bins: [ΔL x Δlog10Ti] =[0.25 x 0.04]. (g, h) 2D histograms versus composition ratio (ci ≡ ni/ nH+ and L. Bins: [ΔL x Δlog10ci]. Purple circles: Cr97 polynomial fit.« less
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