Pitch-angle scattering in pure two-dimensional and two-component turbulence

Details Pitch-angle scattering in pure two-dimensional and two-component turbulence Pitch-angle scattering in pure two-dimensional and two-component turbulence

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...483..371s&link_type=abstract

Astronomy and Astrophysics, Volume 483, Issue 2, 2008, pp.371-381

Astronomy and Astrophysics

Astrophysics

10

Diffusion, Turbulence, Scattering

Scientific paper

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.

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