TITLE

Random walk of magnetic field lines in dynamical turbulence: A field line tracing method. I. Slab turbulence

AUTHOR(S)
Shalchi, A.
PUB. DATE
August 2010
SOURCE
Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p082902
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
To study the wandering of magnetic field lines is an important subject in theoretical physics. Results of field line random walk theories can be applied in plasma physics as well as astrophysics. Previous investigations are based on magnetostatic models. These models have been used in analytical work as well as in computer simulations to warrant mathematical and numerical tractability. To replace the magnetostatic model by a dynamical turbulence model is a difficult task. In the present article, a field line tracing method is used to describe field line wandering in dynamical magnetic turbulence. As examples different models are employed, namely, the plasma wave model, the damping model of dynamical turbulence, and the random sweeping model. It is demonstrated that the choice of the turbulence model has a very strong influence on the field line structure. It seems that if dynamical turbulence effects are included, Markovian diffusion can be found for other forms of the wave spectrum as in the magnetostatic model. Therefore, the results of the present paper are useful to specify turbulence models. As a further application we consider charged particle transport at early times.
ACCESSION #
53421782

 

Related Articles

  • Distribution of particle velocity perpendicular to magnetic field in turbulent plasma. Fujisawa, A. // Physics of Fluids B: Plasma Physics;May93, Vol. 5 Issue 5, p1482 

    In a turbulent magnetized plasma a relationship between velocity distribution of particles and its stochastic electric field is studied by solving the equation of motion both analytically and numerically. The distribution of velocity perpendicular to magnetic field direction is shown to be...

  • Numerical simulations of ion temperature gradient-driven turbulence. Ottaviani, M.; Romanelli, F.; Benzi, R.; Briscolini, M.; Santangelo, P.; Succi, S. // Physics of Fluids B: Plasma Physics;Jan90, Vol. 2 Issue 1, p67 

    High resolution numerical simulations of plasma turbulence driven by ion temperature gradients in the presence of magnetic field inhomogeneities have been performed with special attention to the behavior of the anomalous ion energy flux. The pressure gradient evolution is treated consistently...

  • Secondary instabilities of large scale flow and magnetic field in the electromagnetic short wavelength drift-Alfve´n wave turbulence. Smolyakov, A.; Diamond, P.; Kishimoto, Y. // Physics of Plasmas;Sep2002, Vol. 9 Issue 9, p3826 

    It is shown that the short wavelength (k²[sub ⊥]ρ²[sub i] > 1, k[sub ⊥] is the characteristic wave vector, and ρ[sub i] is the ion Larmor radius) electromagnetic drift wave turbulence in typical conditions is unstable with respect to the excitation of large scale...

  • Random walk of magnetic field lines in dynamical turbulence: A field line tracing method. II. Two-dimensional turbulence. Guest, B.; Shalchi, A. // Physics of Plasmas;Mar2012, Vol. 19 Issue 3, p032902 

    The wandering of magnetic field lines is an important topic in theoretical plasma physics and astrophysics. Previous analytical work, as well as computer simulations, is based on magnetostatic models to warrant mathematical and numerical tractability. Recently, we have studied the first time...

  • Three-dimensional fluid simulations of a simple magnetized toroidal plasma. Ricci, Paolo; Rogers, B. N. // Physics of Plasmas;Sep2009, Vol. 16 Issue 9, p092307 

    Three-dimensional fluid simulations are performed in a simple magnetized toroidal plasma, in which vertical and toroidal magnetic fields create helicoidal magnetic field lines that terminate on the torus vessel. The simulations are carried out in the three-dimensional flux tube that wraps around...

  • Fluctuations in electron-positron plasmas: Linear theory and implications for turbulence. Gary, S. Peter; Karimabadi, Homa // Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p042104 

    Linear kinetic theory of electromagnetic fluctuations in a homogeneous, magnetized, collisionless electron-positron plasma predicts two lightly damped modes propagate at relatively long wavelengths: an Alfvén-like mode with dispersion ωr=k∥vA and a magnetosonic-like mode with...

  • Transport scalings in reversed field pinch plasmas. Yamagishi, T. // Physics of Fluids (00319171);Feb86, Vol. 29 Issue 2, p594 

    A simple saturation condition for a magnetic turbulence is derived based on the nonlinearity of electron orbit diffusion, which is applied for derivation of transport coefficients in the reversed field pinch plasmas. The scalings as well as magnitudes of the plasma temperature and energy...

  • Spectral scaling in the turbulent Earth's plasma sheet revisited. Vörös, Z.; Baumjohann, W.; Nakamura, R.; Runov, A.; Volwerk, M.; Asano, Y.; Jankovičová, D.; Lucek, E. A.; Rème, H. // Nonlinear Processes in Geophysics;2007, Vol. 14 Issue 4, p535 

    Bursty bulk flow associated magnetic fluctuations exhibit at least three spectral scaling ranges in the Earth's plasma sheet. Two of the three scaling ranges can be associated with multi-scale magnetohydrodynamic turbulence between the spatial scales from ~100 km to several RE (RE is the Earth's...

  • Magnetic flux compression by dynamic plasmas. I. Subsonic self-similar compression of a magnetized plasma-filled liner. Felber, F. S.; Liberman, M. A.; Velikovich, A. L. // Physics of Fluids (00319171);Dec88, Vol. 31 Issue 12, p3675 

    New self-similar solutions describe the subsonic compression of a plasma with an entrained axial magnetic field by a thin cylindrical liner. Effects of Ohmic dissipation, thermal conductivity, and plasma turbulence are included. The self-similar solutions, obtained in an explicit analytic form,...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics