Turbulence Fluide et Plasma-en Turbulence Fluide et Plasma-fr
[Turbulence Fluide et Plasma] Structures and Magnetohydrodynamic Turbulence
article rubrique
Sunday 28 November 2010
traduction
Mirror instability: From quasi-linear diffusion to coherent structures
Hellinger, P., Kuznetsov, E., Passot, T., Sulem, P.L. and Trávnícek, P.M.,
A model for the nonlinear dynamics of mirror modes near the instability threshold is presented. By matching the quasi-linear theory for the space-averaged (...) Read the whole article
Sunday 28 November 2010
traduction
Transient growth in stable collisionless plasma
Camporeale, E., Burgess, D. and Passot, T
The first kinetic study of transient growth for a collisionless homogeneous Maxwellian plasma in a uniform magnetic field is presented. A system which is linearly stable may display (...) Read the whole article
Saturday 27 November 2010
traduction
Energy Decay Laws in Strongly Anisotropic Magnetohydrodynamic Turbulence
Bigot, B., Galtier, S. and Politano, H
We present a set of three-dimensional direct numerical simulations of incompressible decaying magnetohydrodynamic turbulence in which we investigate the influence of an external (...) Read the whole article
Saturday 27 November 2010
traduction
The Hanle effect in a random magnetic field. Dependence of the polarization on statistical properties of the magnetic field
Frisch, H., Anusha, L.S., Sampoorna, M. and Nagendra, K.N
The Hanle effect is used to determine weak turbulent magnetic fields in the solar atmosphere, usually assuming that the angular distribution is isotropic, the magnetic field strength (...) Read the whole article
Saturday 27 November 2010
traduction
Dynamo action at low magnetic Prandtl numbers : mean flow versus fully turbulent motions
Y Ponty, P D Mininni, J-F Pinton, H Politano and A Pouquet
We compute numerically the threshold for dynamo action in Taylor-Green (TG) swirling flows. Kinematic dynamo calculations, for which the flow field is fixed to its time average, are (...) Read the whole article
Saturday 27 November 2010
traduction
Effect of the Lorentz force on on-off dynamo intermittency
A. Alexakis and Y. Ponty
An investigation of the dynamo instability close to the threshold produced by an ABC forced flow is presented. We focus on the on-off intermittency behavior of the dynamo and the (...) Read the whole article
Saturday 27 November 2010
traduction
Subcritical Dynamo Bifurcation in the Taylor-Green Flow
Y. Ponty
In collaboration with J.-P. Laval, B. Dubrulle, F. Daviaud, and J.-F. Pinton We report direct numerical simulations of dynamo generation for flow generated using a Taylor-Green (...) Read the whole article
Saturday 27 November 2010
traduction
Scaling Laws of Turbulence and Heating of Fast Solar Wind: The Role of Density Fluctuations
V. Carbone, R. Marino, L. Sorriso-Valvo, A. Noullez, and R. Bruno
Incompressible and isotropic magnetohydrodynamic turbulence in plasmas can be described by an exact relation for the energy flux through the scales. This Yaglom-like scaling law has (...) Read the whole article
Saturday 27 November 2010
traduction
Quasicollapse of oblique solitons of the weakly dissipative derivative nonlinear Schrödinger equation
G. Sánchez-Arriaga , D. Laveder, T. Passot, and P. L. Sulem
Numerical integrations of the derivative nonlinear Schrödinger equation for Alfvén waves, supplemented by a weak dissipative term (originating from diffusion or Landau damping), with (...) Read the whole article
Friday 26 November 2010
traduction
Dispersive MHD turbulence in one dimension
D. Laveder, L.Marradi, T.Passot, P.L.Sulem
Numerical simulations of dispersive turbulence in magnetized plasmas based on the Hall-MHD description are presented, assuming spatial variations along a unique direction making a (...) Read the whole article