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EP: Fachverband Extraterrestrische Physik

EP 9: Sonne und Heliosphäre II

EP 9.3: Vortrag

Freitag, 1. März 2013, 10:00–10:15, HS 9

Kinetic Simulations of Nonlinear Wave Interactions in Type II Bursts — •Urs Ganse¹, Felix Spanier², Patrick Kilian², and Rami Vainio¹ — ¹Department of Physics, University of Helsinki, Finland — ²Lehrstuhl für Astronomie, Universität Würzburg

Type II radiobursts are commonly accepted to originate from CME- and flare driven shocks, with observational evidence of electron beam populations in the purported emission regions. Using the kinetic particle-in-cell code ACRONYM, we have investigated nonlinear wave interaction processes in CME foreshock regions in presence of electron beams. Focus lay on the quantitative analysis of wave kinematics: excitation of electrostatic waves by the electron beams and and nonlinear coupling to tranverse magnetic modes can be observed in the simulation data. By varying parameters of the background plasma, the emission process at low and high heliocentric distances have been compared, and found to be very similar despite a significant difference in density and magnetization.