|The Expanding Box Model in ECHO: Application to the Parametric Decay of Alfvén Waves in the Fast Solar Wind
|459, 6th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2011)
|Del Zanna, L.; Landi, S.; Matteini, L.; Velli, M.
|The nonlinear evolution and the decay instability of monochromatic
Alfvén waves in the fast solar wind is studied through MHD numerical
simulations taking into account the effects of the radial expansion
of the background plasma. This is achieved by means of the
expanding box model, a local approach which allows to
maintain Cartesian coordinates and periodical boundary conditions.
In this contribution we discuss the implementation of the model
in the ECHO code and we present preliminary results of the
decay instability in the presence of radial expansion effects.