3D MHD description of the region beyond the termination shock: The behaviour of the Current Sheet

Details 3D MHD description of the region beyond the termination shock: The behaviour of the Current Sheet 3D MHD description of the region beyond the termination shock: The behaviour of the Current Sheet

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh21a0485o&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH21A-0485

Physics

2124 Heliopause And Solar Wind Termination, 2149 Mhd Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

A fully self consistent MHD study of the heliosheath region is carried out, using BATSRUS, a three dimensional time dependent adaptive grid magnetohydrodynamic (MHD) model. The heliosheath, located between the termination shock and the heliopause, has not been studied in detail. At the termination shock the solar wind passes from a supersonic to a subsonic regime decelerating until it reaches the heliopause where it is diverted to the heliotail. This region is intersected in the equatorial plane (assuming a no-tilt for the dipole field) by a current sheet as the solar magnetic field changes polarity. One of the major questions is whether the current sheet remains at the equatorial plane. The magnetic field of the solar wind is included. In order to isolate the effects at this region we assumed no magnetic field in the interstellar medium. We observe a much faster flow of the current sheet, where the compressed azimuthal magnetic field is absent, leading to large velocity shear. With BATSRUS, we were able to obtain high resolution needed to analyze the behavior of this complicated regime, in particular the stability of the current sheet. We report the results and comment on the major processes responsible.

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