English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 57998/91535 (63%)
造訪人次 : 13701284      線上人數 : 41
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/119810


    題名: Electron Pitch-Angle Scattering by Oblique Whistler Waves: Comparison between Test Particle Simulation and Quasi-Linear Theory
    作者: Otsuka, F.;Wang, K.;Hada, T.;Matsukiyo, S.
    日期: 2020-11-16
    上傳時間: 2020-12-31 12:11:05 (UTC+8)
    摘要: Whistler-mode waves play an important role in pitch-angle scattering of electrons in the Earth's magnetosphere. THEMIS mission revealed that oblique whistler-mode waves were present at dipolarization sites near the magnetic equator in the tailside around L=10. The observed wave frequencies are in the range between the proton gyrofrequency and half the electron gyrofrequency. For these obliquely propagating electromagnetic waves, not only cyclotron resonance but also Landau resonance (or transit time damping) contributes to the electron scattering [1, 2]. When the wave amplitude is small and the spectrum is broadband, the standard
    quasi-linear theory is known to work quite well to describe the pitch-angle diffusion of particles (e.g., [3]). For exactly parallel propagation cases, the validity of the quasi-linear description was examined by test particle simulations (e.g., [4, 5]). However, quasi-linear
    diffusion with obliquely propagating whistler mode waves has not been discussed in detail using test particle simulations. In this presentation, we study the electron pitch-angle scattering caused by the oblique whistler waves, performing test particle simulations. We specify the oblique whistler waves obeying the cold plasma dispersion relation and assume a Gaussian wave spectrum. We integrate the motion of relativistic electrons in the given electromagnetic fields and evaluate the pitch angle diffusion coefficients for different set of parameters.
    We compare the numerical diffusion coefficient with those predicted by the quasi-linear theory, and discuss the dependence on the wave propagation angle relative to the background magnetic field. The results will be applied to understanding of the electron scattering process in the dipolarization sites of the Earth's magnetosphere.
    顯示於類別:[航空太空工程學系暨研究所] 會議論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    index.html0KbHTML14檢視/開啟

    在機構典藏中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋