Kinetic measurements of shock wave propagation in a three-dimensional complex (dusty) plasma

Physics

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Dusty Or Complex Plasmas, Plasma Crystals, Electrostatic Waves And Oscillations, Shock Waves And Discontinuities, Planetary Bow Shocks, Interplanetary Shocks

Scientific paper

“Complex plasmas” consist of electrons, ions, and charged microparticles. The latter are individually observable, allowing kinetic measurements in plasmas. Using a sudden gas pulse, a traveling perturbation was initiated in such a complex plasma and its propagation, acceleration, and steepening—possibly into a shock was followed. The experiment was performed in the PKE-Nefedov laboratory under microgravity conditions on the international space station, i.e., in a complex plasma cloud with very little stored (potential or free) energy and thus free of, e.g., parametric instabilities. The perturbation front remained remarkably smooth, with a microroughness of the order of the interparticle distance. The observations are presented and interpreted.

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