The 90-degree problem of scattering theory revisited: dynamical turbulence effects versus nonlinear effects

A. Dosch, Ioannis Kourakis, A. Shalchi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The 90° problem of cosmic-ray transport theory is revisited in this paper. By using standard forms of the wave spectrum in the solar wind, the pitch-angle Fokker–Planck coefficient and the parallel mean free path are computed for different resonance functions. A critical comparison is made of the strength of 90° scattering due to plasmawave effects, dynamical turbulence effects and nonlinear effects. It is demonstrated that, only for low-energy cosmic particles, dynamical effects are usually dominant. The novel results presented here are essential for an effective comparison of heliospheric observations for the parallel mean free path with the theoretical model results.
Original languageEnglish
Pages (from-to)2595/1-2595/16
Number of pages16
JournalJournal of Physics G: Nuclear and Particle Physics
Volume34
Issue number12
DOIs
Publication statusPublished - 01 Dec 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

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