In weakly collisional and collisionless magnetized plasmas, the pressure–strain interaction describes the rate of conversion between bulk flow and thermal energy density. In this study, we derive an analytical expression for the pressure–strain interaction in a coordinate system with an axis aligned with the local magnetic field. The result is eight groups of terms corresponding to different physical mechanisms that can contribute to the pressure–strain interaction. We provide a physical description of each term. The results are immediately of interest to weakly collisional and collisionless magnetized plasmas and the fundamental processes that happen therein, including magnetic reconnection, magnetized plasma turbulence, and collisionless shocks. The terms in the field-aligned coordinate decomposition are likely accessible to measurement with satellite observations.
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December 2022
Research Article|
December 19 2022
Pressure–strain interaction. II. Decomposition in magnetic field-aligned coordinates
Paul A. Cassak
;
Paul A. Cassak
a)
(Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Writing – original draft)
1
Department of Physics and Astronomy, West Virginia University
, Morgantown, West Virginia 26506, USA
2
Center for KINETIC Plasma Physics, West Virginia University
, Morgantown, West Virginia 26506, USA
a)Author to whom correspondence should be addressed: [email protected]
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M. Hasan Barbhuiya
;
M. Hasan Barbhuiya
(Formal analysis, Investigation, Methodology, Writing – review & editing)
1
Department of Physics and Astronomy, West Virginia University
, Morgantown, West Virginia 26506, USA
2
Center for KINETIC Plasma Physics, West Virginia University
, Morgantown, West Virginia 26506, USA
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H. Arthur Weldon
H. Arthur Weldon
(Formal analysis, Methodology, Writing – review & editing)
1
Department of Physics and Astronomy, West Virginia University
, Morgantown, West Virginia 26506, USA
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a)Author to whom correspondence should be addressed: [email protected]
Phys. Plasmas 29, 122307 (2022)
Article history
Received:
September 10 2022
Accepted:
November 17 2022
Connected Content
This is a companion to:
Pressure–strain interaction. I. On compression, deformation, and implications for Pi-D
A companion article has been published:
Pressure–strain interaction. III. Particle-in-cell simulations of magnetic reconnection
Citation
Paul A. Cassak, M. Hasan Barbhuiya, H. Arthur Weldon; Pressure–strain interaction. II. Decomposition in magnetic field-aligned coordinates. Phys. Plasmas 1 December 2022; 29 (12): 122307. https://doi.org/10.1063/5.0125252
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