Collisionless shock waves in space and in astrophysics

Physics – Plasma Physics

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Collisionless Plasmas, Plasma Waves, Shock Waves, Space Plasmas, Energy Dissipation, International Sun Earth Explorers, Magnetohydrodynamic Stability, Shock Wave Propagation, Solar Corona

Scientific paper

The state of knowledge on collisionless shock waves in space plasma since the ISEE missions is reviewed. The dissipation mechanism, areas where progress is scarce, and the possibility of transferring knowledge to astrophysical shocks are discussed. For the laminar quasiperpendicular dispersive shock, the dissipation mechanism is the modified two stream instability which heats the electrons and the ions. For other shock structures, the mechanism is unclear. Astrophysical shocks have extreme values for the characteristic parameters, therefore it is necessary to explore in the solar system (in space) shocks which extend, in parameter space, the region explored until now. Coronal shocks could be the link between space observations and astrophysical shocks.

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