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: email@example.com
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
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