Electrostatic plasma turbulence Part 1. Turbulent plasma diffusion across a magnetic field
Abstract
The turbulent diffusion of plasma across a magnetic field is studied theoretically using a threedimensional model which includes the full dynamics of the diffusing particles and which is valid for arbitrary magnetic field strengths. The theory is confined to perpendicular turbulence, i.e. where the buildup of the fluctuations lies primarily in the plane perpendicular to the magnetic field (although it is more generally applicable). A single expression for the diffusion is derived in terms of the fluctuation spectrum, particle energy, the dispersion characteristics of the excited modes and the magnetic field. Earlier results for equilibrium plasmas are confirmed. We demonstrate the continuous transition from anomalous (1/B) diffusion in regimes of low fluctuation levels (or strong magnetic fields) to classical (1/B^{2}) diffusion in regimes where the fluctuation level destroys the coherence sustained by the magnetic field. In this latter regime, the particles behave as if unmagnetized except for a turbulent drift which appears in the presence of anisotropic spectra.
 Publication:

Journal of Plasma Physics
 Pub Date:
 April 1976
 DOI:
 10.1017/S0022377800019802
 Bibcode:
 1976JPlPh..15..279B
 Keywords:

 Electrostatic Waves;
 Plasma Diffusion;
 Plasma Turbulence;
 Turbulent Diffusion;
 Integral Equations;
 Magnetic Effects;
 Magnetic Fields;
 Propagation Velocity;
 Tensor Analysis;
 Thermal Plasmas;
 Vlasov Equations;
 Plasma Physics