T. Passot
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View article: Impact of pressure anisotropy on the cascade rate of Hall magnetohydrodynamic turbulence with biadiabatic ions
Impact of pressure anisotropy on the cascade rate of Hall magnetohydrodynamic turbulence with biadiabatic ions Open
The impact of ion pressure anisotropy on the energy cascade rate of Hall-MHD turbulence with biadiabatic ions and isothermal electrons is evaluated in three-dimensional direct numerical simulations, using the exact (or third-order) law der…
View article: Impact of pressure anisotropy on the cascade rate of Hall-MHD turbulence with biadiabatic ions
Impact of pressure anisotropy on the cascade rate of Hall-MHD turbulence with biadiabatic ions Open
The impact of ion pressure anisotropy on the energy cascade rate of Hall-MHD turbulence with biadiabatic ions and isothermal electrons is evaluated in three-dimensional direct numerical simulations, using the exact (or third-order) law der…
View article: Gyrofluid simulations of turbulence and reconnection in space plasmas
Gyrofluid simulations of turbulence and reconnection in space plasmas Open
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View article: Interaction between non-linear plasma structures and collisionless shocks: magnetic holes vs cometary shock
Interaction between non-linear plasma structures and collisionless shocks: magnetic holes vs cometary shock Open
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…
View article: Influence of ion-to-electron temperature ratio on tearing instability and resulting subion-scale turbulence in a low-<b> <i>β</i> </b> <i>e</i> collisionless plasma
Influence of ion-to-electron temperature ratio on tearing instability and resulting subion-scale turbulence in a low-<b> <i>β</i> </b> <i>e</i> collisionless plasma Open
A two-field gyrofluid model including ion finite Larmor radius (FLR) corrections, magnetic fluctuations along the ambient field, and electron inertia is used to study two-dimensional reconnection in a low βe collisionless plasma, in a plan…
View article: Gyrofluid simulations of turbulence and reconnection in space plasmas
Gyrofluid simulations of turbulence and reconnection in space plasmas Open
A Hamiltonian two-field gyrofluid model is used to investigate the dynamics of an electron-ion collisionless plasma subject to a strong ambient magnetic field, within a spectral range extending from the magnetohydrodynamic (MHD) scales to …
View article: Influence of ion-to-electron temperature ratio on tearing instability and resulting subion-scale turbulence in a low-$β_e$ collisionless plasma
Influence of ion-to-electron temperature ratio on tearing instability and resulting subion-scale turbulence in a low-$β_e$ collisionless plasma Open
A two-field gyrofluid model including ion finite Larmor radius (FLR) corrections, magnetic fluctuations along the ambient field and electron inertia is used to study two-dimensional reconnection in a low $β_e$ collisionless plasma, in a pl…
View article: Turbulent Regimes in Collisions of 3D Alfvén-wave Packets
Turbulent Regimes in Collisions of 3D Alfvén-wave Packets Open
Using three-dimensional gyrofluid simulations, we revisit the problem of Alfvén-wave (AW) collisions as building blocks of the Alfvénic turbulent cascade and their interplay with magnetic reconnection at magnetohydrodynamic (MHD) scales. D…
View article: Turbulent regimes in collisions of 3D Alfvén-wave packets
Turbulent regimes in collisions of 3D Alfvén-wave packets Open
Using 3D gyrofluid simulations, we revisit the problem of Alfven-wave (AW) collisions as building blocks of the Alfvenic cascade and their interplay with magnetic reconnection at magnetohydrodynamic (MHD) scales. Depending on the large-sca…
View article: Generalized Fluid Models of the Braginskii Type
Generalized Fluid Models of the Braginskii Type Open
Several generalizations of the well-known fluid model of Braginskii (1965) are considered. We use the Landau collisional operator and the moment method of Grad. We focus on the 21-moment model that is analogous to the Braginskii model, and…
View article: Direct kinetic Alfvén wave energy cascade in the presence of imbalance
Direct kinetic Alfvén wave energy cascade in the presence of imbalance Open
A two-field Hamiltonian gyrofluid model for kinetic Alfvén waves retaining ion finite Larmor radius corrections and parallel magnetic field fluctuations is used to study direct turbulent cascades from the magnetohydrodynamic to the sub-ion…
View article: Fluid Energy Cascade Rate and Kinetic Damping: New Insight from 3D Landau-fluid Simulations
Fluid Energy Cascade Rate and Kinetic Damping: New Insight from 3D Landau-fluid Simulations Open
Using an exact law for incompressible Hall magnetohydrodynamics (HMHD) turbulence, the energy cascade rate is computed from three-dimensional HMHD-CGL (biadiabatic ions and isothermal electrons) and Landau-fluid numerical simulations that …
View article: Bridging hybrid- and full-kinetic models with Landau-fluid electrons
Bridging hybrid- and full-kinetic models with Landau-fluid electrons Open
Context. Magnetic reconnection plays a fundamental role in plasma dynamics under many different conditions, from space and astrophysical environments to laboratory devices. High-resolution in situ measurements from space missions allow nat…
View article: Modeling Imbalanced Collisionless Alfvén Wave Turbulence with Nonlinear Diffusion Equations
Modeling Imbalanced Collisionless Alfvén Wave Turbulence with Nonlinear Diffusion Equations Open
A pair of nonlinear diffusion equations in Fourier space is used to study the dynamics of strong Alfvén wave turbulence, from MHD to electron scales. Special attention is paid to the regime of imbalance between the energies of counter-prop…
View article: Modeling imbalanced collisionless Alfv\\'en wave turbulence with\n nonlinear diffusion equations
Modeling imbalanced collisionless Alfv\\'en wave turbulence with\n nonlinear diffusion equations Open
A pair of nonlinear diffusion equations in Fourier space} is used to study\nthe dynamics of strong Alfv\\'en-wave turbulence, from MHD to electron scales.\nSpecial attention is paid to the regime of imbalance between the energies of\ncount…
View article: Structure and evolution of magnetohydrodynamic solitary waves with Hall and finite Larmor radius effects
Structure and evolution of magnetohydrodynamic solitary waves with Hall and finite Larmor radius effects Open
Nonlinear and low-frequency solitary waves are investigated in the framework of the one-dimensional Hall-magnetohydrodynamic model with finite Larmor effects and two different closure models for the pressures. For a double adiabatic pressu…
View article: A reduced Landau-gyrofluid model for magnetic reconnection driven by electron inertia
A reduced Landau-gyrofluid model for magnetic reconnection driven by electron inertia Open
An electromagnetic reduced gyrofluid model for collisionless plasmas, accounting for electron inertia, finite ion Larmor radius effects and Landau-fluid closures for the electron fluid is derived by means of an asymptotic expansion from a …
View article: Gyrofluid modeling and phenomenology of low-<i>βe</i> Alfvén wave turbulence
Gyrofluid modeling and phenomenology of low-<i>βe</i> Alfvén wave turbulence Open
A two-field reduced gyrofluid model including electron inertia, ion finite Larmor radius corrections, and parallel magnetic field fluctuations is derived from the model of Brizard [Brizard, Phys. Fluids B 4, 1213 (1992)]. It assumes low βe…
View article: Fluid and gyrofluid modeling of low-$\beta_e$ plasmas: phenomenology of kinetic Alfvén wave turbulence
Fluid and gyrofluid modeling of low-$\beta_e$ plasmas: phenomenology of kinetic Alfvén wave turbulence Open
Reduced fluid models including electron inertia and ion finite Larmor radius corrections are derived asymptotically, both from fluid basic equations and from a gyrofluid model. They apply to collisionless plasmas with small ion-to-electron…
View article: Electron-scale reduced fluid models with gyroviscous effects
Electron-scale reduced fluid models with gyroviscous effects Open
Reduced fluid models for collisionless plasmas including electron inertia and finite Larmor radius corrections are derived for scales ranging from the ion to the electron gyroradii. Based either on pressure balance or on the incompressibil…
View article: Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping
Three-dimensional Simulations and Spacecraft Observations of Sub-ion Scale Turbulence in the Solar Wind: Influence of Landau Damping Open
Three-dimensional nonlinear finite Larmor radius (FLR)–Landau fluid simulations, which include some small-scale kinetic effects, are performed to explore the nature of the sub-ion scale turbulence in the solar wind and to investigate the …
View article: Reduced models accounting for parallel magnetic perturbations: gyrofluid and finite Larmor radius–Landau fluid approaches
Reduced models accounting for parallel magnetic perturbations: gyrofluid and finite Larmor radius–Landau fluid approaches Open
Reduced models are derived for a strongly magnetized collisionless plasma at scales which are large relative to the electron thermal gyroradius and in two asymptotic regimes. One corresponds to cold ions and the other to far sub-ion scales…
View article: Special issue: Pellat thesis prize winners
Special issue: Pellat thesis prize winners Open
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View article: Steady mirror structures in a plasma with pressure anisotropy
Steady mirror structures in a plasma with pressure anisotropy Open
In the first part we present a review of our results concerning the weakly nonlinear regime of the mirror instability in the framework of an asymptotic model. This model belongs to the class of gradient type systems for which the free ener…