The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015
Abstract
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 »
- Authors:
-
[2];
[2];
[2];
- Southwest Research Inst., San Antonio, TX (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of New Hampshire, Durham, NH (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Aeronautics and Space Administration (NASA); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1394981
- Report Number(s):
- LA-UR-17-24831
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- AC52-06NA25396; NAS5-01072
- Resource 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
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Heliospheric and Magnetospheric Physics
Citation Formats
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., 2017.
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. https://doi.org/10.1002/2017JA024183
Jahn, J. M., Goldstein, J., Reeves, Geoffrey D., Fernandes, Philip A., Skoug, Ruth M., Larsen, Brian Arthur, and Spence, H. E. Mon .
"The Warm Plasma Composition in the Inner Magnetosphere during 2012–2015". United States. https://doi.org/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}
}
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