Bonn 2010 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 16: Sun II

EP 16.2: Vortrag

Freitag, 19. März 2010, 09:00–09:15, AKM

Kinetic Simulations of Type II Radio Burst Emission Processes — •Urs Ganse1, Rami Vainio2, and Felix Spanier11Lehrstuhl für Astronomie, Universität Würzburg — 2Department of Physics, University of Helsinki

While the phenomenology of type II radio bursts is rather well studied, the detailed mechanism of the emission is not fully understood. Rather than trying to find the correct evolution of the CME using methods of fluid dynamics or combined fluid/kinetic methods, we are using a fully kinetic approach to model the movement of particles in a shock environment, therefore neglecting the large scale evolution of the shock, while correctly modelling the kinetic microphysics. The kinetic simulation itself is based on fully-relativistic Particle-in-Cell methods. This technique allows for observation of plasma wave excitation in the shock region and gives a deep insight into the mechanisms of emission and transformation of different wave modes. We were using Fourier- and Laplace-transform based analysis to identify wave modes and electromagnetic emission, especially focused on their evolution in time. Our simulations were able to produce phenomenological features similar to type II radio bursts, with a focus on production of waves through three-wave interaction. We present results of these simulations and compare them to previous models of radio burst modeling.

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