Abstract
Pitch-angle scattering rates for cosmic-ray particles in MHD simulations with imbalanced turbulence are calculated for fully evolving electromagnetic turbulence. We compare with theoretical predictions derived from the quasilinear theory of cosmic-ray diffusion for an idealized slab spectrum and demonstrate how cross helicity affects the shape of the pitch-angle diffusion coefficient. Additional simulations in evolving magnetic fields or static field configurations provide evidence that the scattering anisotropy in imbalanced turbulence is not primarily due to coherence with propagating Alfvén waves, but an effect of the spatial structure of electric fields in cross-helical MHD turbulence.
| Original language | English |
|---|---|
| Article number | 8 |
| Journal | Astrophysical Journal |
| Volume | 811 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 11 Sep 2015 |
Keywords
- cosmic rays
- diffusion
- magnetohydrodynamics (MHD)
- scattering
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Profiles
-
Bogdan Teaca
- Faculty Research Centre in Fluid and Complex Systems - Assistant Professor (Academic)
Person: Teaching and Research