Role of cross helicity in magnetohydrodynamic turbulence
arXiv:0807.2635 · doi:10.1103/PhysRevLett.102.025003
Abstract
Strong incompressible three-dimensional magnetohydrodynamic turbulence is investigated by means of high resolution direct numerical simulations. The simulations show that the configuration space is characterized by regions of positive and negative cross-helicity, corresponding to highly aligned or anti-aligned velocity and magnetic field fluctuations, even when the average cross-helicity is zero. To elucidate the role of cross-helicity, the spectra and structure of turbulence are obtained in imbalanced regions where cross-helicity is non-zero. When averaged over regions of positive and negative cross-helicity, the result is consistent with the simulations of balanced turbulence. An analytical explanation for the obtained results is proposed.
arXiv comment4 pages, 4 figures
References in corpus (13)
- A weak turbulence theory for incompressible MHD
- Spectrum of magnetohydrodynamic turbulence
- Simulations of Incompressible MHD Turbulence
- On the Spectrum of Magnetohydrodynamic Turbulence
- Spectral energy dynamics in magnetohydrodynamic turbulence
- Dynamic Alignment in Driven Magnetohydrodynamic Turbulence
- Imbalanced Strong MHD Turbulence
- Strong Imbalanced Turbulence
- Strong Anisotropic MHD Turbulence with Cross Helicity
- Rapid directional alignment of velocity and magnetic field in magnetohydrodynamic turbulence
- Imbalanced Weak MHD Turbulence
- On weak and strong magnetohydrodynamic turbulence
- Numerical Measurements of the Spectrum in Magnetohydrodynamic Turbulence
Cited by in corpus (74)
- Astrophysical gyrokinetics: kinetic and fluid turbulent cascades in magnetized weakly collisional plasmas
- Perpendicular Ion Heating by Low-Frequency Alfven-Wave Turbulence in the Solar Wind
- The Evolution and Role of Solar Wind Turbulence in the Inner Heliosphere
- Recent progress in astrophysical plasma turbulence from solar wind observations
- Dependence of solar wind power spectra on the direction of the local mean magnetic field
- Incorporating Kinetic Physics into a Two-Fluid Solar-Wind Model with Temperature Anisotropy and Low-Frequency Alfven-Wave Turbulence
- Power and spectral index anisotropy of the entire inertial range of turbulence in the fast solar wind
- Acceleration of primary and secondary particles in galaxy clusters by compressible MHD turbulence: from radio halos to gamma rays
- Parker Solar Probe: Four Years of Discoveries at Solar Cycle Minimum
- Anisotropy of Alfvénic Turbulence in the Solar Wind and Numerical Simulations
- Astrophysical hydromagnetic turbulence
- Turbulence, Magnetic Reconnection in Turbulent Fluids and Energetic Particle Acceleration
- Residual Energy Spectrum of Solar Wind Turbulence
- Anisotropy of Imbalanced Alfvenic Turbulence in Fast Solar Wind
- A Weakened Cascade Model for Turbulence in Astrophysical Plasmas
- Spectral scaling laws in MHD turbulence simulations and in the solar wind
- Constraining Low-Frequency Alfvenic Turbulence in the Solar Wind Using Density Fluctuation Measurements
- Alfven Wave Turbulence and Perpendicular Ion Temperatures in Coronal Holes
- A statistical model of three-dimensional anisotropy and intermittency in strong Alfvénic turbulence
- Reflection-driven MHD turbulence in the solar atmosphere and solar wind
- Violation of the zeroth law of turbulence in space plasmas
- Scaling laws and diffuse locality of balanced and imbalanced MHD turbulence
- Scale interactions in magnetohydrodynamic turbulence
- Damping of Alfven waves by Turbulence and its Consequences: from Cosmic-Rays Streaming to Launching Winds
- Structure of Stationary Strong Imbalanced Turbulence
- MHD Turbulence
- Critical Balance and the Physics of MHD Turbulence
- Physical Interpretation of the Angle Dependent Magnetic Helicity Spectrum in the Solar Wind: The Nature of Turbulent Fluctuations near the Proton Gyroradius Scale
- Theory of incompressible MHD turbulence with scale-dependent alignment and cross-helicity
- Spectrum of weak magnetohydrodynamic turbulence
- Frame Dependence of the Electric Field Spectrum of Solar Wind Turbulence
- Parallel electric field generation by Alfven wave turbulence
- Dynamic Alignment and Exact Scaling Laws in MHD Turbulence
- Direct and Inverse Cascades in the Acceleration Region of the Fast Solar Wind
- Strong magnetohydrodynamic turbulence with cross helicity
- Alignment and scaling of large-scale fluctuations in the solar wind
- Applicability of Taylor's Hypothesis during Parker Solar Probe perihelia
- On the Scaling Properties of Magnetic Field Fluctuations Through the Inner Heliosphere
- Reconnection-controlled decay of magnetohydrodynamic turbulence and the role of invariants
- Magneto-immutable turbulence in weakly collisional plasmas
- Numerical simulations of strong incompressible magnetohydrodynamic turbulence
- MHD Turbulence, Turbulent Dynamo and Applications
- Numerical simulations of imbalanced strong magnetohydrodynamic turbulence
- Imbalanced kinetic Alfvén wave turbulence: from weak turbulence theory to nonlinear diffusion models for the strong regime
- Impact of Residual Energy on Solar Wind Turbulent Spectra
- The Turbulent Heating Rate in Strong MHD Turbulence with Nonzero Cross Helicity
- Weak Alfven-Wave Turbulence Revisited
- Helicity-conservative finite element discretization for incompressible MHD systems
- On the evolution of the Anisotropic Scaling of Magnetohydrodynamic Turbulence in the Inner Heliosphere
- Alfven Wave Collisions, The Fundamental Building Block of Plasma Turbulence III: Theory for Experimental Design
- Kinetic range spectral features of cross-helicity using MMS
- Reduction of compressibility and parallel transfer by Landau damping in turbulent magnetized plasmas
- Spectral Anisotropy of Elsässer Variables in Two Dimensional Wave-vector Space as Observed in the Fast Solar Wind Turbulence
- Magnetohydrodynamic turbulence in a strongly magnetised plasma
- Cosmic-ray pitch-angle scattering in imbalanced MHD turbulence simulations
- Quantification of MagLIF morphology using the Mallat Scattering Transformation
- The spectrum of magnetized turbulence in the interstellar medium
- Cross helicity of interplanetary coronal mass ejections at 1 au
- Tridimensional to bidimensional transition in magnetohydrodynamic turbulence with a guide field and kinetic helicity injection
- Acceleration of Particles in Imbalanced Magnetohydrodynamic Turbulence
- Impact of observational uncertainties on universal scaling of MHD turbulence
- Extended Scaling Laws in Numerical Simulations of MHD Turbulence
- Comparison of forcing functions in magnetohydrodynamic turbulence
- Lagrangian statistics of a shock-driven turbulent dynamo in decaying turbulence
- Kinetic Simulations of Imbalanced Turbulence in a Relativistic Plasma: Net Flow and Particle Acceleration
- On the Statistics of Elsasser Increments in Solar Wind and Magnetohydrodynamic Turbulence
- The Lagrangian frequency spectrum as a diagnostic for magnetohydrodynamic turbulence dynamics
- Effect of Spherical Polarization on the Magnetic Spectrum of the Solar Wind
- The effects of finite electron inertia on helicity-barrier-mediated turbulence
- Evolution of MHD turbulence in the expanding solar wind: residual energy and intermittency
- Mallat Scattering Transformation based surrogate for MagnetoHydroDynamics
- Modelling cosmic-ray transport: magnetised versus unmagnetised motion in astrophysical magnetic turbulence
- Initiation of Alfvénic turbulence by Alfven wave collisions: A numerical study
- Introduction to Strong Alfvénic MHD Turbulence