Physics – Plasma Physics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..185v&link_type=abstract
In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 185-188 (SEE N94-22624 05-75)
Physics
Plasma Physics
Interplanetary Medium, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Magnetohydrodynamics, Solar Wind, Compressible Flow, Earth Magnetosphere, Magnetic Field Configurations
Scientific paper
Results from numerical simulations of the evolution of nonlinear waves and compressible Magnetohydrodynamic (MHD) turbulence in the solar wind are presented. The basic properties of the background flow, namely the solar wind expansion are taken into account. The evolution of a plasma parcel in a comoving frame of reference is studied. The main features of the expansion may be introduced in a cartesian geometry with periodic boundary conditions by expanding the equations in a small parameter, the angular dimensions of the box as viewed from the Sun. The box is seen to expand in the plane normal to the radial direction and the expansion is followed by using stretched coordinates in this plane. The expansion naturally introduces an anisotropic damping effect on velocity and magnetic field, as well as the Parker like rotation of the average magnetic fied. It is shown how this affects the evolution of an initially circularly polarized large amplitude Alfven wave in oblique propagation. Results for evolution in two dimensions and their relevance to solar wind in situ measurements are discussed.
Grappin Roland
Velli M. M.
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