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Plasma dynamics is a multi-scale problem that involves many spatial and temporal scales. Turbulence connects the disparate scales in this system through a cascade that is established by nonlinear interactions. Most astrophysical plasma systems are weakly collisional, making a fully kinetic Vlasov description of the system essential. The use of reduced models to study such systems is computationally desirable, but careful benchmarking of physics in different models is needed. We perform one such comparison here between the fully kinetic Particle-In-Cell model and a two-fluid model that includes Hall physics and electron inertia, with a particular focus on the sub-proton scale electric field. We show that in general, the two fluid model captures large scale dynamics reasonably well. At smaller scales, the Hall physics is also captured reasonably well by the fluid code, but electron features show departures from the fully kinetic model. Implications for the use of such fluid models are discussed. © 2019 Author(s).


Documento: Artículo
Título:Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations
Autor:González, C.A.; Parashar, T.N.; Gomez, D.; Matthaeus, W.H.; Dmitruk, P.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, United States
Instituto de Astronoma y Física Del Espacio, CONICET-UBA, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Palabras clave:Collisional plasmas; Electric fields; Electromagnetic fields; Plasma diagnostics; Plasma flow; Plasma theory; Two phase flow; Astrophysical plasma; Electron inertia; Kinetic modeling; Large-scale dynamics; Multiscale problem; Nonlinear interactions; Particle-in-cell model; Spatial and temporal scale; Kinetics
Título revista:Physics of Plasmas
Título revista abreviado:Phys. Plasmas


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---------- APA ----------
González, C.A., Parashar, T.N., Gomez, D., Matthaeus, W.H. & Dmitruk, P. (2019) . Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations. Physics of Plasmas, 26(1).
---------- CHICAGO ----------
González, C.A., Parashar, T.N., Gomez, D., Matthaeus, W.H., Dmitruk, P. "Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations" . Physics of Plasmas 26, no. 1 (2019).
---------- MLA ----------
González, C.A., Parashar, T.N., Gomez, D., Matthaeus, W.H., Dmitruk, P. "Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations" . Physics of Plasmas, vol. 26, no. 1, 2019.
---------- VANCOUVER ----------
González, C.A., Parashar, T.N., Gomez, D., Matthaeus, W.H., Dmitruk, P. Turbulent electromagnetic fields at sub-proton scales: Two-fluid and full-kinetic plasma simulations. Phys. Plasmas. 2019;26(1).