Effect of Magnetic-Field Gradient on Positron Acceleration along the Magnetic Field in an Oblique Shock Wave
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概要
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Ultrarelativistic positron acceleration along the magnetic field due to shock waves in an electron-positron-ion plasma is studied with use of one-dimension (one space coordinate and three velocities), fully kinetic, fully electromagnetic, particle simulations. First, ultrarelativistic acceleration to γ ∼ 104 in a uniform external magnetic field B0 is demonstrated with a simulation with the shock speed vsh close to c cos θ, where c is the speed of light and θ is the angle between the external magnetic field and the wave normal. Then, the effect of non-uniformity of B0 is investigated; comparisons are made of two different cases: 1) the strength of the external magnetic field increases as a shock wave propagates (∇B0 is parallel to the wave normal), and 2) it decreases (∇B0 is unti-parallel to the wave normal). It is found that positron acceleration in the latter tends to be stronger than in the former.
著者
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Ohsawa Yukiharu
Department Of Physics Nagoya University
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Iwata Takashi
Department Of Horticulture
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Takahashi Seiichi
Department Of Electrical Engineering And Electronics Aoyama Gakuin University
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OHSAWA Yukiharu
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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IWATA Takashi
Department of Physics, Nagoya University, Nagoya 464-8602, Japan
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