壓力非均向電漿中慢速震波之模擬研究;Hybrid simulations of slow shock formation in anisotropic plasmas

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Title:	壓力非均向電漿中慢速震波之模擬研究;Hybrid simulations of slow shock formation in anisotropic plasmas
Authors:	黃允威;Huang,Yun-Wei
Contributors:	太空科學研究所
Keywords:	模擬;慢速震波;混合粒子碼;黎曼問題;磁重聯;壓力非均向;電流片;simulation;slow shock;hybrid;reconnection;anisotropic;current sheet
Date:	2015-07-23
Issue Date:	2015-09-23 10:50:04 (UTC+8)
Publisher:	國立中央大學
Abstract:	在本論文中，我們以一維混合粒子數值碼為研究工具，利用電流片結構為初始條件之黎曼問題方法 (Riemann problem)，研究震波及不連續面結構之生成，並且探討系統中，磁壓熱壓比與壓力非均向性對結構生成之影響。根據磁流體理論，慢速震波會有異常的行為。而在模擬結果中，異常慢速震波會在初始條件為壓力非均向之系統中生成，其中，於慢速震波之上游區域出現波列結構 (wavetrain) 以及傳播速度較旋轉不連續面快之異常現象均會在特定參數範圍下生成。;In this study we carry out the one-dimensional hybrid particle simulations of shock waves and discontinuities. The shock waves and discontinuities are generated in the plasma current sheet by means of the Riemann problem. The effects of pressure anisotropy and plasma beta on the discontinuity properties are examined. According to the Magnetohydrodynamics theory, slow shocks may become anomalous in anisotropic plasmas. The simulation results of this study show that the anomalies slow shocks may be generated in the kinetic simulations with initial temperature anisotropy. In particular, slow shocks with upstream wavetrains or moving ahead of rotational discontinuity may form for certain parameter regimes.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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