SULEM , Pierre-Louis

Three-dimensional simulations of turbulence in collisionless plasmas are presented, using a fluid model that extends the anisotropic MHD to scales of the order of the ion gyroradius and below in directions perpendicular to the ambient magnetic field. This model, which includes linear Landau damping and finite Larmor radius corrections to all...

Reduced models are derived for a strongly magnetized collisionless plasma at scales large relatively to the electron thermal gyroradius, in two asymptotic regimes. One corresponds to cold ions and the other to far sub-ion scales. By including the electron pressure dynamics , these models improve the Hall reduced MHD and the kinetic Alfvén wave...

Rolls in finite Prandtl number rotating convection with free-slip top and bottom boundary conditions are shown to be unstable with respect to small angle perturbations for any value of the rotation rate. This instability is driven by the horizontal mean flow whose estimation requires a special singular perturbation analysis.

A Hamiltonian two-field gyrofluid model for kinetic Alfvén waves (KAWs) in a magnetized electron–proton plasma, retaining ion finite-Larmor-radius corrections and parallel magnetic field fluctuations, is used to study the inverse cascades that develop when turbulence is randomly driven at sub-ion scales. In the directions perpendicular to the...

Velocity shear driven vortices associated to the Kelvin-Helmholtz instability (KHI) have been detected by in-situ observations at the Earth, Saturn and Mercury magnetospheres' boundary due to the interaction with the solar wind. KHI in magnetized plasmas have been widely studied numerically in the framework of a fluid and hybrid descriptions,...

Linear Magnetic Holes (LMHs) are magnetic field depressions generated in the solar wind upstream of planetary and cometary shock. Some of those structures are reminiscent of mirror modes, thus possibly linked to the mirror mode instability driven by a temperature anisotropy in a large plasma beta environment. LMHs have also been found...