Evolution of Magnetohydrodynamic Waves and Acceleration of Particles in a Collision of Two Plasmas(Gases, plasmas, electric discharges, and beams)

概要

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Electron acceleration in magnetohydrodynamic waves produced by a collision of two high-temperature plasmas in an external magnetic field B_0 is studied with particle simulations. First, possible particle motions that traverse multiple layers with alternating magnetic polarity are illustrated. Then, it is shown with one-dimensional, fully kinetic, relativistic, electromagnetic particle simulations that as a result of plasma collision, a large-amplitude Alfven wave packet can be formed behind a magnetosonic shock wave. In the wave packet with alternating magnetic polarity, some electrons exhibit orbits predicted by the physical considerations and are accelerated to high energies such that γ>100. It is thus found that the Alfven wave packet as well as the magnetosonic shock wave can create ultrarelativistic particles with its strong wave fields.
社団法人日本物理学会の論文
2008-08-15