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Title: The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015

Ionospheric heavy ions play an important role in the dynamics of Earth's magnetosphere. The greater mass and gyro radius of ionospheric oxygen differentiates its behavior from protons at the same energies. Oxygen may have an impact on tail reconnection processes, and it can at least temporarily dominate the energy content of the ring current during geomagnetic storms. At sub-keV energies, multi-species ion populations in the inner magnetosphere form the warm plasma cloak, occupying the energy range between the plasmasphere and the ring current. Lastly, cold lighter ions from the mid-latitude ionosphere create the co-rotating plasmasphere whose outer regions can interact with the plasma cloak, plasma sheet, ring current, and outer electron belt. Here in this paper we present a statistical view of warm, cloak-like ion populations in the inner magnetosphere, contrasting in particular the warm plasma composition during quiet and active times. We study the relative abundances and absolute densities of warm plasma measured by the Van Allen Probes, whose two spacecraft cover the inner magnetosphere from plasmaspheric altitudes close to Earth to just inside geostationary orbit. We observe that warm (>30 eV) oxygen is most abundant closer to the plasmasphere boundary whereas warm hydrogen dominates closer to geostationary orbit.more » Warm helium is usually a minor constituent, but shows a noticeable enhancement in the near-Earth dusk sector.« less
Authors:
 [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ;  [3]
  1. Southwest Research Inst., San Antonio, TX (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of New Hampshire, Durham, NH (United States)
Publication Date:
Report Number(s):
LA-UR-17-24831
Journal ID: ISSN 2169-9380
Grant/Contract Number:
AC52-06NA25396; NAS5-01072
Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 11; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
National Aeronautic and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Heliospheric and Magnetospheric Physics
OSTI Identifier:
1394981

Jahn, J. M., Goldstein, J., Reeves, Geoffrey D., Fernandes, Philip A., Skoug, Ruth M., Larsen, Brian Arthur, and Spence, H. E.. The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015. United States: N. p., Web. doi:10.1002/2017JA024183.
Jahn, J. M., Goldstein, J., Reeves, Geoffrey D., Fernandes, Philip A., Skoug, Ruth M., Larsen, Brian Arthur, & Spence, H. E.. The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015. United States. doi:10.1002/2017JA024183.
Jahn, J. M., Goldstein, J., Reeves, Geoffrey D., Fernandes, Philip A., Skoug, Ruth M., Larsen, Brian Arthur, and Spence, H. E.. 2017. "The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015". United States. doi:10.1002/2017JA024183. https://www.osti.gov/servlets/purl/1394981.
@article{osti_1394981,
title = {The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015},
author = {Jahn, J. M. and Goldstein, J. and Reeves, Geoffrey D. and Fernandes, Philip A. and Skoug, Ruth M. and Larsen, Brian Arthur and Spence, H. E.},
abstractNote = {Ionospheric heavy ions play an important role in the dynamics of Earth's magnetosphere. The greater mass and gyro radius of ionospheric oxygen differentiates its behavior from protons at the same energies. Oxygen may have an impact on tail reconnection processes, and it can at least temporarily dominate the energy content of the ring current during geomagnetic storms. At sub-keV energies, multi-species ion populations in the inner magnetosphere form the warm plasma cloak, occupying the energy range between the plasmasphere and the ring current. Lastly, cold lighter ions from the mid-latitude ionosphere create the co-rotating plasmasphere whose outer regions can interact with the plasma cloak, plasma sheet, ring current, and outer electron belt. Here in this paper we present a statistical view of warm, cloak-like ion populations in the inner magnetosphere, contrasting in particular the warm plasma composition during quiet and active times. We study the relative abundances and absolute densities of warm plasma measured by the Van Allen Probes, whose two spacecraft cover the inner magnetosphere from plasmaspheric altitudes close to Earth to just inside geostationary orbit. We observe that warm (>30 eV) oxygen is most abundant closer to the plasmasphere boundary whereas warm hydrogen dominates closer to geostationary orbit. Warm helium is usually a minor constituent, but shows a noticeable enhancement in the near-Earth dusk sector.},
doi = {10.1002/2017JA024183},
journal = {Journal of Geophysical Research. Space Physics},
number = 11,
volume = 122,
place = {United States},
year = {2017},
month = {9}
}