Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.1277v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A2, p. 1277-1292.
Physics
19
Hodographs, Magnetic Field Configurations, Magnetohydrodynamic Waves, Solar Magnetic Field, Wave Packets, Magnetopause, Solar Wind, Wave Propagation
Scientific paper
A hybrid numerical code is employed to trace the evolution of rotational discontinuities (RDs). An extensive parameter variation is carried out, with particular emphasis on beta, Ti/Te, thetaB (the angle between the normal and total magnetic field), and the helicity of the RD. The RD structure is shown to have features in common with the evolution of both strongly modulated nonlinear wave packets and linear dispersive wave propagation in oblique magnetic fields. For small thetaB, the RD disperses linearly, giving fast and Alfven waves upstream and downstream, respectively, and the familiar S-shaped hodograms. At larger thetaB, nonlinearity becomes important and strong coupling to a compressional (sonic) component can occur in the main current layer. The results are applied to RDs observed in the solar wind and at the magnetopause.
Cargill Peter J.
Vasquez Bernard J.
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