The mechanism of ion heating and energy redistribution in a collisionless shock wave

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Collisionless Plasmas, Energy Distribution, Gas-Ion Interactions, Ion Temperature, Shock Wave Interaction, Space Plasmas, Mach Number, Magnetoacoustic Waves, Plasma Diagnostics, Reflectance, Satellite Observation

Scientific paper

The evolution of the energy spectrum of ions passing through the front of a magnetoacoustic collisionless shock wave (CSW) has been investigated experimentally. The Alfven-Mach numbers of the CSW were in the range 1.6-6.1. Ions reflected from the CSW were observed throughout the entire range of Alfven-Mach numbers. Comparison of the experimental results with observations of the earth bow shock and planetary CSWs showed that ion-ion interaction at the wave front is the main mechanism of energy dissipation in the directed flow of plasma motion. Ion-ion interaction at low Alfven-Mach numbers is caused by heating of the distribution function core, and at high Alfven-Mach numbers by an increase in the number of reflected ions. The behavior of the distribution function of the reflected ions in the intermediate Alfven-Mach number regime is briefly discussed.

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