English  |  正體中文  |  简体中文  |  Items with full text/Total items : 74010/74010 (100%)
Visitors : 24678594      Online Users : 265
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version

    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/72543

    Title: 磁鏡不穩定性之磁流體與混合粒子碼模擬研究;A study of mirror instability in fluid and particle simulations
    Authors: 張竣凱;Chang,Chun-Kai
    Contributors: 太空科學研究所
    Keywords: 磁鏡不穩定性;電漿;太空物理;磁流體力學;mirror instability;plasma;space physics;magnetohydrodynamic
    Date: 2016-07-04
    Issue Date: 2016-10-13 18:07:04 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 無碰撞的電漿在磁場中,壓力會呈現非均向性的情況。當垂直磁場方向的壓力(p⊥)大於沿磁場的壓力(p∥)時,會產生磁鏡不穩定性。依電漿微觀動力學理論,其發生條件為 β∥<β⊥^2/(1+β⊥)。在 double-polytropic 磁流體模式中,其不穩定發生條件為 γ∥β∥<β⊥2^2/(2+γ⊥β⊥),當 γ⊥=2、γ∥=0.5 時,與微觀動力理論相同。本論文探討在不同的電漿模式下,包括磁流體數值模式、霍爾磁流體數值模式、以及混合粒子碼,磁鏡不穩定性的發展以及差異。利用三種不同尺度的數值模式分析電漿於空間中的分佈,磁場隨時間的改變,以及壓力隨時間的變化。同時,於不同的熱力狀態下,分析其對於磁鏡不穩定性發展的差異。另外,在混合粒子模式中,探討帶電粒子之運動。;Mirror instability may occur in magnetized and collisionless plasmas when the perpendicular pressure with respect to the magnetic field is greater than the parallel pressure. The mirror instability criterion is β∥<β⊥^2/(1+β⊥) in the kinetic theory. While in the double-ploytropic magnetohydrodynamic (MHD) model, for γ⊥=2,γ∥=0.5 the instability criterion γ∥β∥<β⊥^2/(2+γ⊥β⊥) is coincident with the kinetic theory. In this study we use three different simulation models, MHD, Hall MHD, and hybrid particle models, to investigate the nonlinear evolution of mirror instability. We analyze the distribution of plasma and magnetic field as well as thermal pressure in time. The mirror instability under different thermodynamic conditions is also examined. In the hybrid particle simulations we further examine the motion of charged particles.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

    Files in This Item:

    File Description SizeFormat

    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 隱私權政策聲明