Speaker
Alex Ivascenko
(North-West University)
Description
The transport of charged particles in turbulent magnetic fields is a topic of
great interest in astrophysics, since our ability to successfully use cosmic
rays as astronomic messengers depends on our understanding of the transport
processes. One of the primary effects is the scattering of particles on
magnetic irregularities leading in the first instance to a change in the
pitch-angle $\mu$ of the particle. Further transport parameters e.g. diffusion
coefficients or the mean free path can then be inferred from $\Delta \mu$.
We introduce new numerical methods to evaluate the pitch angle diffusion
coefficient $D_{\mu\mu}$ and the perpendicular diffusion coefficent $D_\perp$ that
work well in both weak and strong turbulence scenarios and compare with
analytic results from Quasi Linear Theory.
We present results obtained by applying these methods to test-particle data
from simulation of heliospheric conditions with our spectral MHD code Gismo.
The results are then compared with test-particle simulations of the novel
Perlin-noise-type pseudo-turbulence to show its viability for large-scale
particle transport simulations.
| Registration number following "ICRC2015-I/" | 435 |
|---|---|
| Collaboration | -- not specified -- |
Author
Alex Ivascenko
(North-West University)
Co-authors
Felix Spanier
(North-West University)
Urs Ganse
(University of Helsinki)
