Wave-Wave Interaction in Astrophysical Shocks and the Interstellar Medium

• Applicant: Dr. Felix Spanier
• Subject Area: Astrophysics and Astronomy
• Term: from 2006 to 2012
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 21214829

Turbulence in the vicinity of astrophysical shocks is usually to be composed of MHD waves. Models for the cascade of one wavemode is neglect, interactions between different wavemodes. Vainio & Spanier (2005) however were able to show that wavemode interactions can change the properties of turbulence significantly. Still a complete model of turbulence modelled by MHD waves is not at hand. I therefore suggest to develop a numerical model in which three major components are used to describe the turbulent cascade: First of all the cascading of wave energy within one wavemode, then the energy transfer between wavemodes by wave wave interactions and finally the influence of wave damping on these cascades. This model is applicable to the generation of wave-like turbulence at shockfronts, where MHD waves are thought to be responsible for the acceleration of Cosmic Rays. The results of this model are also applicable for the interstellar medium where it can clarify the nature of turbulence.

• DFG Programme: Research Fellowships
• International Connection: Finland
• Host: Professor Rami Vainio