Jena 2013 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: Poster Session

EP 4.23: Poster

Dienstag, 26. Februar 2013, 11:15–12:45, Poster OG

MHD simulations: Corotating Interaction Regions — •Tobias Wiengarten, Horst Fichtner, and Jens Kleimann — Theoretische Physik IV, Ruhr-Universität Bochum, Germany

Corotating Interaction Regions (CIRs) form in the solar wind when, due to the rotation of the Sun, parcels of fast-speed wind interact with slow-speed wind. The resulting build-up of pressure generates waves that with increasing time (or distance from the Sun) may evolve into a so-called forward-reverse shock-pair. During solar-quiet times CIRs can be the dominant drivers for shaping large-scale structures in the heliosphere. Studying CIRs is also important because the associated shocks are capable of (re-)accelerating energetic particles or deflect cosmic rays. The global, three-dimensional structure of CIRs is modeled with an MHD approach that gives the plasma quantities needed to model the transport and acceleration of particles in the heliosphere (with, e.g., stochastic differential equations (SDEs), see the talk by Effenberger).
Here, we show results from 3D-MHD simulations made with our code CRONOS for a) analytic boundary conditions where results can be compared with those obtained with a different code and b) boundary conditions derived from observational data that are compared to spacecraft observations.