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| Paper: |
Charged Particle Transport in Turbulent Media |
| Volume: |
488, 8th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2013) |
| Page: |
35 |
| Authors: |
Spanier, F.; Ivascenko, A.; Lange, S.; Schreiner, C. |
| Abstract: |
The interstellar medium as well as the heliosphere is permeated by non-thermal particles with energies ranging from a few keV to 1020 eV. The transport of these particles is dominated by wave-particle interactions with the turbulent magnetic fields of the background plasma. Since these are complicated nonlinear processes, a detailed study is possible only with numerical simulations. The general problem in performing numerical simulations of high-energy charged particle transport is the large scale separation of the thermal background and the non-thermal component. We have targeted this problem from two sides: Using a hybrid-MHD model incorporating charged test particles and a fluid background we have investigated the physics of wave-particle interaction. These results have then been compared with particle-in-cell simulation results. In this presentation we will show the possibilities and limitations of both numerical approaches. The second major topic is the actual connection between the numerical experiment and the physics behind this: Charged particle transport in space plasmas is studied by means of pitch angle diffusion coefficients as long as field-line wandering is not dominant (cf. Laitinen et al. 2013). The derivation of these coefficients from simulations is prone to errors. We present two new methods to analyze data. |
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