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Title: Low‐Resource Technique for Measurement of H + and O + in the Terrestrial Magnetosphere

Abstract

Abstract Measurement of O + in the Earth's magnetosphere is important for monitoring and understanding the initiation and evolution of geomagnetic activity. During active times, O + can be the most abundant ion in the magnetosphere. Furthermore, because O + and H + damage exposed spacecraft materials through different processes, measurement and prediction of O + and H + fluxes is critical for understanding cumulative damage effects to these materials resulting from the ambient plasma environment of a spacecraft. We describe a simple technique for quantitative, in situ measurement of O + and H + fluxes using ultrathin foils. This technique is a low‐resource addition to a standard electrostatic energy‐per‐charge analyzer followed by an array of detectors. H + and O + abundances up to a few tens of keV can be determined by comparison of counts in detectors having no ultrathin foil at the detector aperture, in which both H + and O + are detected, and adjacent detectors having a foil over the aperture of the appropriate thickness to stop the transmission of O + but through which H + can transit. We describe three techniques for implementing this method enabling differentiation of O + and H +more » in an instrument package significantly simpler than traditional mass spectrometers.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [3]
+ Show Author Affiliations
  1. Los Alamos National Laboratory Los Alamos NM USA
  2. NASA Goddard Space Flight Center Greenbelt MD USA
  3. Planetary Science Institute Tucson AZ USA
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1575845
Alternate Identifier(s):
OSTI ID: 1575847; OSTI ID: 1579700
Report Number(s):
LA-UR-19-24746
Journal ID: ISSN 2169-9380
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Published Article
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Name: Journal of Geophysical Research. Space Physics Journal Volume: 124 Journal Issue: 11; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; mass spectrometry; mass spectroscopy; composition measurement technique; ultrathin foil; low‐resource technique; heavy ion measurement

Citation Formats

Fernandes, P. A., Funsten, H. O., Dors, E. E., Harper, R. W., Larsen, B. A., MacDonald, E. A., Reisenfeld, D. B., Skoug, R. M., Steinberg, J. T., and Thomsen, M. F. Low‐Resource Technique for Measurement of H + and O + in the Terrestrial Magnetosphere. United States: N. p., 2019. Web. doi:10.1029/2019JA027138.
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Fernandes, P. A., Funsten, H. O., Dors, E. E., Harper, R. W., Larsen, B. A., MacDonald, E. A., Reisenfeld, D. B., Skoug, R. M., Steinberg, J. T., & Thomsen, M. F. Low‐Resource Technique for Measurement of H + and O + in the Terrestrial Magnetosphere. United States. https://doi.org/10.1029/2019JA027138
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Fernandes, P. A., Funsten, H. O., Dors, E. E., Harper, R. W., Larsen, B. A., MacDonald, E. A., Reisenfeld, D. B., Skoug, R. M., Steinberg, J. T., and Thomsen, M. F. Wed . "Low‐Resource Technique for Measurement of H + and O + in the Terrestrial Magnetosphere". United States. https://doi.org/10.1029/2019JA027138.
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@article{osti_1575845,
title = {Low‐Resource Technique for Measurement of H + and O + in the Terrestrial Magnetosphere},
author = {Fernandes, P. A. and Funsten, H. O. and Dors, E. E. and Harper, R. W. and Larsen, B. A. and MacDonald, E. A. and Reisenfeld, D. B. and Skoug, R. M. and Steinberg, J. T. and Thomsen, M. F.},
abstractNote = {Abstract Measurement of O + in the Earth's magnetosphere is important for monitoring and understanding the initiation and evolution of geomagnetic activity. During active times, O + can be the most abundant ion in the magnetosphere. Furthermore, because O + and H + damage exposed spacecraft materials through different processes, measurement and prediction of O + and H + fluxes is critical for understanding cumulative damage effects to these materials resulting from the ambient plasma environment of a spacecraft. We describe a simple technique for quantitative, in situ measurement of O + and H + fluxes using ultrathin foils. This technique is a low‐resource addition to a standard electrostatic energy‐per‐charge analyzer followed by an array of detectors. H + and O + abundances up to a few tens of keV can be determined by comparison of counts in detectors having no ultrathin foil at the detector aperture, in which both H + and O + are detected, and adjacent detectors having a foil over the aperture of the appropriate thickness to stop the transmission of O + but through which H + can transit. We describe three techniques for implementing this method enabling differentiation of O + and H + in an instrument package significantly simpler than traditional mass spectrometers.},
doi = {10.1029/2019JA027138},
journal = {Journal of Geophysical Research. Space Physics},
number = 11,
volume = 124,
place = {United States},
year = {Wed Nov 13 00:00:00 EST 2019},
month = {Wed Nov 13 00:00:00 EST 2019}
}
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