Pressure anisotropy and small spatial scales induced by velocity shear
Year: 2016
Authors: Del Sarto D., Pegoraro F., Califano F.
Autors Affiliation: Inst Jean Lamour; Univ Lorraine; Univ Pisa; Univ Pisa
Abstract: By including the full pressure tensor dynamics in a fluid plasma model, we show that a sheared velocity field can provide an effective mechanism that makes the initial isotropic pressure nongyrotropic. This is distinct from the usual gyrotropic anisotropy related to the fluid compressibility and usually accounted for in double-adiabatic models. We determine the time evolution of the pressure agyrotropy and discuss how the propagation of “”magnetoelastic perturbations”” can affect the pressure tensor anisotropization and its spatial filamentation, which are due to the action of both the magnetic field and the flow strain tensor. We support this analysis with a numerical integration of the nonlinear equations describing the pressure tensor evolution.
Journal/Review: PHYSICAL REVIEW E
Volume: 93 (5) Pages from: to:
KeyWords: plasma anisotropyDOI: 10.1103/PhysRevE.93.053203Citations: 68data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-27References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here