Lagrangian Perspectives on the Small-scale Structure of Alfvénic Turbulence and Stochastic Models for the Dispersion of Fluid Particles and Magnetic Field Lines in the Solar Wind

Lagrangian perspectives on the small-scale structure of anisotropic Alfvénic turbulence are adopted. We are interested in relating the statistical properties of the Eulerian field increments evaluated along the fluid particle trajectories, in the direction perpendicular to the guiding magnetic field...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2024-07, Vol.273 (1), p.15
Main Authors: Bian, N. H., Li, Gang
Format: Article
Language:English
Subjects:
Dispersion
Fluid dynamics
Fluid flow
Interplanetary turbulence
Jupiter
Magnetic fields
Magnetic properties
Magnetohydrodynamics
Particle trajectories
Phenomenology
Solar energetic particles
Solar magnetic field
Solar wind
Stochastic models
Trajectory analysis
Turbulence
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Summary:Lagrangian perspectives on the small-scale structure of anisotropic Alfvénic turbulence are adopted. We are interested in relating the statistical properties of the Eulerian field increments evaluated along the fluid particle trajectories, in the direction perpendicular to the guiding magnetic field and along the magnetic field lines. We establish the basis for a unified multifractal phenomenology of Eulerian and Lagrangian Alfvénic turbulence. The critical balance condition is generalized to structure functions of an order different than 2. A Lagrangian perspective is not only useful for investigating the small-scale structure of Alfvénic turbulence, it is also tailored to the modeling of large-scale turbulent transport. Therefore, we develop Lagrangian stochastic models for the dispersion of fluid particles and magnetic field lines in the solar wind. The transport models are based on the integrated Ornstein–Uhlenbeck process that is not Markov, yielding smooth stochastic fluid particle trajectories and magnetic field lines. Brownian diffusion is recovered by tending the integral scale parameter to zero while keeping the diffusivity finite.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ad4a5c