Anomalous diffusion of cosmic rays in magnetic field turbulence - Linkage between diffusion statistics and turbulence statistics

Fumiko Otsuka, Tohru Hada

    研究成果: ジャーナルへの寄稿学術誌査読

    6 被引用数 (Scopus)

    抄録

    Anomalous diffusion of energetic charged particles (cosmic rays) is studied using a simple two-dimensional cross field diffusion model. Both super-diffusion and sub-diffusion can take place in the model. When typical Larmor radius of the particles is much less than the field correlation length, the particles essentially gradient-B drift along equi-contour lines of the magnetic field strength, and thus the diffusion in this parameter regime can essentially be understood by analyzing statistics of the magnetic field islands composed of these equi-contour lines. We numerically evaluate the statistics of the field islands such as the probability distribution function of island radius and fractal dimension of the island contour lines, as functions of the power-law index of the magnetic field turbulence. We find numerically and analytically the scaling laws of time-scale dependent diffusion coefficients using the parameters obtained by analysis of the field islands statistics.

    本文言語英語
    ページ(範囲)204-211
    ページ数8
    ジャーナルProgress of Theoretical Physics Supplement
    162
    DOI
    出版ステータス出版済み - 2006

    !!!All Science Journal Classification (ASJC) codes

    • 物理学および天文学(その他)

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