Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere
Abstract
The region occupying radial distances of ~3–9 Earth radii (R E) in the nightside includes the near-Earth plasma sheet with stretched magnetic field lines and the inner magnetosphere with strong dipolar magnetic field. In this region, the plasma flow energy, which was injected into the inner magnetosphere from the magnetotail, is converted to particle heating and electromagnetic wave generation. These important processes are controlled by plasma anisotropies, which are the focus here. Using measurements of Time History of Events and Macroscale Interactions during Substorms and Van Allen Probes in this transition region we obtain radial profiles of ion and electron temperatures and anisotropies for various geomagnetic activity levels. Ion and electron anisotropies vary with the geomagnetic activity in opposite directions. Parallel anisotropic ions are observed together with transversely anisotropic electrons, whereas the change of ion anisotropy from parallel to transverse (with increasing K p) is accompanied by the electron anisotropy changing from transverse to parallel. Finally, based on plasma anisotropy observations, we estimate that the anisotropy-related currents (curvature currents) are about 10–20% of the diamagnetic currents.
- Authors:
-
[1];
[2];
[2];
[3];
[4]
- Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics; Russian Academy of Sciences (RAS), Moscow (Russian Federation). Space Research Inst.
- Univ. of California, Los Angeles, CA (United States). Inst. of Geophysics and Planetary Physics
- Univ. of New Hampshire, Durham, NH (United States). Inst. for the Study of Earth, Oceans, and Space
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); New Mexico Consortium, Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE; National Aeronautic and Space Administration (NASA)
- OSTI Identifier:
- 1482009
- Report Number(s):
- LA-UR-18-27263
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- AC52-06NA25396; NNX16AF84G; NAS5-02099; NAS5-01072; NNN06AA01C
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 7; 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; plasma sheet; injections; inner magnetosphere; plasma currents
Citation Formats
Artemyev, A. V., Zhang, X. -J., Angelopoulos, V., Runov, A., Spence, H. E., and Larsen, B. A. Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere. United States: N. p., 2018.
Web. doi:10.1029/2018JA025232.
Artemyev, A. V., Zhang, X. -J., Angelopoulos, V., Runov, A., Spence, H. E., & Larsen, B. A. Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere. United States. doi:10.1029/2018JA025232.
Artemyev, A. V., Zhang, X. -J., Angelopoulos, V., Runov, A., Spence, H. E., and Larsen, B. A. Sat .
"Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere". United States. doi:10.1029/2018JA025232. https://www.osti.gov/servlets/purl/1482009.
@article{osti_1482009,
title = {Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere},
author = {Artemyev, A. V. and Zhang, X. -J. and Angelopoulos, V. and Runov, A. and Spence, H. E. and Larsen, B. A.},
abstractNote = {The region occupying radial distances of ~3–9 Earth radii (RE) in the nightside includes the near-Earth plasma sheet with stretched magnetic field lines and the inner magnetosphere with strong dipolar magnetic field. In this region, the plasma flow energy, which was injected into the inner magnetosphere from the magnetotail, is converted to particle heating and electromagnetic wave generation. These important processes are controlled by plasma anisotropies, which are the focus here. Using measurements of Time History of Events and Macroscale Interactions during Substorms and Van Allen Probes in this transition region we obtain radial profiles of ion and electron temperatures and anisotropies for various geomagnetic activity levels. Ion and electron anisotropies vary with the geomagnetic activity in opposite directions. Parallel anisotropic ions are observed together with transversely anisotropic electrons, whereas the change of ion anisotropy from parallel to transverse (with increasing Kp) is accompanied by the electron anisotropy changing from transverse to parallel. Finally, based on plasma anisotropy observations, we estimate that the anisotropy-related currents (curvature currents) are about 10–20% of the diamagnetic currents.},
doi = {10.1029/2018JA025232},
journal = {Journal of Geophysical Research. Space Physics},
number = 7,
volume = 123,
place = {United States},
year = {2018},
month = {6}
}
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