Abstract
Interaction of a parallel fast MHD shock with a layer of decreased density is discussed using ideal MHD approach. This is an extrapolation of gas dynamic “thermal layer” effect on ideal MHD. Computer simulations show that a magnetic field of a moderate intensity (β ∼ 1) may change the character of the flow for intermediate Mach numbers (M ≤ 5) and a new “raking” regime may occur which is not observed in the absence of a magnetic field. Self similar precursor analogous to that in gas dynamics may develop in the case of highM and low density in the layer but magnetic forces essentially decrease its growth rate. This problem appears in connection with cosmical shock propagation where planetary magnetic tails play the role of the “thermal layer”, and it may also be observed in the laboratory when the shock is strong enough to heat the walls ahead of it.
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Aleksandrov, P.E. “Thermal layer” effect in MHD: Interaction of a parallel shock with a layer of decreased density. Shock Waves 3, 73–78 (1993). https://doi.org/10.1007/BF02115886
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DOI: https://doi.org/10.1007/BF02115886