Volume 483, Number 2, May IV 2008
|Page(s)||371 - 381|
|Published online||26 March 2008|
Pitch-angle scattering in pure two-dimensional and two-component turbulence
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany e-mail: firstname.lastname@example.org
2 Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
Accepted: 25 February 2008
Aims. It has been demonstrated that quasilinear theory is inappropriate for describing pitch-angle scattering and parallel spatial diffusion, if a turbulence model with a strong two-dimensional component is assumed. We aim to revisit this problem using a more systematic and reliable approach.
Methods. We consider particle transport in pure two-dimensional turbulence, by using a vector-potential description of pitch-angle scattering.
Results. It is demonstrated that pitch-angle scattering in pure two-dimensional turbulence behaves subdiffusively and, thus, parallel scattering is expected to behave superdiffusively. In the slab/2D composite model, the total pitch-angle Fokker-Planck coefficient reaches the slab limit when very long timescales are considered.
Key words: diffusion / turbulence / scattering
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.