Quasi-parallel collisionless shocks

Physics

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Collisionless Plasmas, Magnetoacoustic Waves, Magnetohydrodynamic Waves, Shock Wave Interaction, Space Plasmas, Bow Waves, International Sun Earth Explorer 1, International Sun Earth Explorer 2, Magnetic Moments, Magnetopause, Shock Heating, Whistlers

Scientific paper

The magnetic field and plasma data from the ISEE 1, 2, and 3 spacecraft have greatly increased knowledge of the quasi-parallel collisionless shock in space. Hybrid-code simulations have provided valuable insights into the physics of the quasi-parallel shock. Unfortunately, theoretical understanding of the nonlinear physics of the quasi-parallel shock is still in a qualitative stage of development. Generation of large-amplitude whistler waves and hydromagnetic waves observed in the quasi-parallel shock has been discussed either in terms of linear instabilities or qualitative nonlinear arguments. It appears that the ion reflection, ion heating, and leakage of the shock-heated downstream ions at the quasi-parallel shock can all be explained in terms of nonadiabatic scatterings of ions by the large-amplitude whistler-magnetosonic waves with frequencies near the ion gyrofrequency and wavelength near the ion inertial length.

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