Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere

Artemyev, A. V.; Zhang, X. -J.; Angelopoulos, V.; Runov, A.; Spence, H. E.; Larsen, B. A.

doi:10.1029/2018JA025232

Title: Plasma Anisotropies and Currents in the Near-Earth Plasma Sheet and Inner Magnetosphere

Journal Article · Sat Jun 30 00:00:00 EDT 2018 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1029/2018JA025232· OSTI ID:1482009

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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)

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.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE; National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC52-06NA25396; NNX16AF84G; NAS5-02099; NAS5-01072; NNN06AA01C

OSTI ID:: 1482009

Report Number(s):: LA-UR-18-27263

Journal Information:: Journal of Geophysical Research. Space Physics, Vol. 123, Issue 7; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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