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Landau fluid closures with nonlinear large-scale finite Larmor radius corrections for collisionless plasmas

Part of: Present Achievements in SpacePlasmas

Published online by Cambridge University Press:  05 September 2014

P. L. Sulem  and
T. Passot
P. L. Sulem*
Affiliation:
Laboratoire J.L. Lagrange, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, CS 34229, 06304 Nice Cedex 4, France
T. Passot
Affiliation:
Laboratoire J.L. Lagrange, Université de Nice-Sophia Antipolis, CNRS, Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, CS 34229, 06304 Nice Cedex 4, France
*
†Email address for correspondence: [email protected]
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Abstract

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With the aim to develop a tool for simulating turbulence in collisionless magnetized plasmas, fluid models retaining low-frequency kinetic effects such as Landau damping and finite Larmor radius (FLR) corrections are discussed. It turns out that, in the absence of ion-cyclotron resonance, the dispersion and damping of kinetic Alfvén waves at scales as small as a fraction of the ion Larmor radius are accurately reproduced when using fluid estimates of the non-gyrotropic moments, at leading-order within a large-scale asymptotics. Differently, evaluations based on the low-frequency linear kinetic theory are necessary in regimes of large temperature anisotropies, and in particular in the presence of the mirror instability. Combining both descriptions leads to a new Landau fluid model retaining large-scale FLR nonlinearities, while reproducing the linear dynamics of low-frequency modes at the sub-ionic scales.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 1 , January 2015 , 325810103
Copyright
Copyright © Cambridge University Press 2014 

References

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