1985/08/01 by H. L. Pécseli, T. Mikkelsen, Torben Mikkelsen · 17 citations
Engineering · Physics and Astronomy · #Autocorrelation #Classical mechanics #Computational physics #Diffusion #Electric field #Eulerian path #Fluid Dynamics and Turbulent Flows #Homogeneity (statistics) #Ionosphere and magnetosphere dynamics #Isotropy #Lagrangian #Mathematical physics #Mean squared displacement #Mechanics #Physics #Plasma #Quantum mechanics #Solar and Space Plasma Dynamics #Test particle #Turbulence #Wavenumber
paper · doi:10.1017/s0022377800002695
published in Journal of Plasma Physics 34(1), 77-94 (Cambridge University Press)
openalex publication_date 1985/08/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/26
Particle diffusion is investigated in a strictly two-dimensional collisionless guiding-centre model for a strongly magnetized plasma. An analytical expression is presented for the entire time variation of the mean square test-particle displacement in the limit of low-frequency, strongly turbulent, electric field fluctuations. The analysis relies on an explicit integral expression for the Lagrangian autocorrelation function in terms of the Eulerian wavenumber spectrum and a time-varying weight function. Bohm diffusion is discussed by means of a simple model spectrum. The analysis applies for turbulent transport associated with electrostatic convective cells, magnetostatic cells and drift wave turbulence with the assumption of local homogeneity and isotropy in two dimensions.