Asymmetric scattering of energetic particles by finite-amplitude circularly polarized Alfvén waves

Details Asymmetric scattering of energetic particles by finite-amplitude circularly polarized Alfvén waves Asymmetric scattering of energetic particles by finite-amplitude circularly polarized Alfvén waves

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aph....10..121s&link_type=abstract

Astroparticle Physics, Volume 10, Issue 1, p. 121-128.

Physics

3

Scientific paper

In the previous paper (M. Ostrowski, G. Siemieniec-Ozieblo, Astropart. Phys. 6 (1997) 271) we demonstrated that the forward-backward asymmetry of particle scattering (as measured in the scattering centre rest frame) at randomly moving scattering centres leads to a regular acceleration term, in addition to the momentum diffusion. Below we consider a physical example of a circularly polarized Alfvén wave showing this asymmetry. We prove it by considering the particle motion perturbed by such finite-amplitude wave. A limited analytic solution for particle trajectory as well as the full numerical one are discussed. Finally, we note a few astrophysical situations expected to allow for turbulence with a nonzero helicity and the regular acceleration accompanying the Fermi diffusive process.

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