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  4. Comparative analysis of the various generalized Ohm's law terms in magnetosheath turbulence as observed by magnetospheric multiscale
 
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Comparative analysis of the various generalized Ohm's law terms in magnetosheath turbulence as observed by magnetospheric multiscale
File(s)
2020JA028447.pdf (4.87 MB)
Published version
Author(s)
Stawarz, JE
Matteini, L
Parashar, TN
Franci, L
Eastwood, JP
more
Type
Journal Article
Abstract
Decomposing the electric field (E) into the contributions from generalized Ohm's law provides key insight into both nonlinear and dissipative dynamics across the full range of scales within a plasma. Using high‐resolution, multi‐spacecraft measurements of three intervals in Earth's magnetosheath from the Magnetospheric Multiscale mission, the influence of the magnetohydrodynamic, Hall, electron pressure, and electron inertia terms from Ohm's law, as well as the impact of a finite electron mass, on the turbulent E spectrum are examined observationally for the first time. The magnetohydrodynamic, Hall, and electron pressure terms are the dominant contributions to E over the accessible length scales, which extend to scales smaller than the electron inertial length at the greatest extent, with the Hall and electron pressure terms dominating at sub‐ion scales. The strength of the non‐ideal electron pressure contribution is stronger than expected from linear kinetic Alfvén waves and a partial anti‐alignment with the Hall electric field is present, linked to the relative importance of electron diamagnetic currents in the turbulence. The relative contribution of linear and nonlinear electric fields scale with the turbulent fluctuation amplitude, with nonlinear contributions playing the dominant role in shaping E for the intervals examined in this study. Overall, the sum of the Ohm's law terms and measured E agree to within ∼ 20% across the observable scales. These results both confirm general expectations about the behavior of E in turbulent plasmas and highlight features that should be explored further theoretically.
Date Issued
2021-01
Date Acceptance
2020-11-13
Citation
Journal of Geophysical Research: Space Physics, 2021, 126 (1), pp.1-14
URI
http://hdl.handle.net/10044/1/85047
URL
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028447
DOI
https://www.dx.doi.org/10.1029/2020ja028447
ISSN
2169-9380
Publisher
American Geophysical Union (AGU)
Start Page
1
End Page
14
Journal / Book Title
Journal of Geophysical Research: Space Physics
Volume
126
Issue
1
Copyright Statement
© 2020. The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
http://creativecommons.org/licenses/by/4.0/
Sponsor
Science and Technology Facilities Council (STFC)
The Royal Society
Identifier
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020JA028447
Grant Number
ST/S000364/1
URF\R1\201286
Subjects
0201 Astronomical and Space Sciences
0401 Atmospheric Sciences
Publication Status
Published
Date Publish Online
2020-12-11
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