Fluid description of Weibel-type instabilities via full pressure tensor dynamics
Institut Jean Lamour, UMR 7198 CNRS - Université de Lorraine - Vandœuvre-lès-Nancy, France
Received: 1 July 2016
Accepted: 24 August 2016
We discuss a fluid model for the description of Weibel-type instabilties based on the inclusion of the full pressure tensor dynamics. The linear analysis first performed by Basu B., Phys. Plasmas, 9, (2002) 5131, for the strong anisotropy limit of Weibel's instability is extended to include the coupling between pure Weibel's and current filamentation instability, and the potential of this fluid approach is further developed. It is shown to allow an easier interpretation of some physical features of these coupled modes, notably the role played by thermal effects. It can be used to identify the role of different closure conditions in pressure-driven instabilities which can be numerically investigated at a remarkably lower computational cost than with kinetic simulations.
PACS: 52.35.Qz – Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.) / 52.25.Dg – Plasma kinetic equations / 52.65.Kj – Magnetohydrodynamic and fluid equation
© EPLA, 2016