3-D SIMULATION OF HIGH-LATITUDE INTERACTION REGIONS - COMPARISON WITH ULYSSES RESULTS

A three-dimensional (3-D) magnetohydrodynamic (MHD) numerical model is used to stimulate the global evolution of a steady, tilted-dipole solar wind flow configuration similar to that prevalent in interplanetary space in 1993. Systematic latitudinal changes in the structure of a corotating interaction region (CIR) near 5 AU is shown to agree well with recent Ulysses observations. The abrupt disappearance of forward shocks and continued persistence of reverse shocks poleward of the latitude where Ulysses crossed the southern edge of the coronal streamer belt is explained as a natural consequence of the 3-D flow geometry.