The thickness of resistive-dispersive shocks

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Magnetohydrodynamic Waves, Mathematical Models, Plasma-Electromagnetic Interaction, Shock Waves, Solar Terrestrial Interactions, Thickness, Beta Factor, Bow Waves, Magnetopause, Magnetotails, Viscosity

Scientific paper

The thicknesses of slow, intermediate, and fast shocks described by the resistive-dispersive plasma model of Hau and Sonnerup (1990) are examined, with special attention given to slow shocks in the distant magnetotail and on the intermediate shocks that may possibly occur at the magnetopause. Also considered were subcritical fast shocks which have both upstream and downstream states supersonic and in which resistivity alone is also sufficient to provide the transition. It is shown that subcritical fast shocks, as well as slow shocks with a thickness of a few lambda(i) may be generated from the resistive Hall and Sonnerup model. On the other hand, for typical magnetopause parameters, the model gives rise to intermediate shocks with thicknesses that are substantially greater than the typically observed width of the magnetopause (about 5 to 10 lambda(i)).

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