Nonadiabatic interaction between a charged particle and an MHD pulse

Y. Kuramitsu, T. Hada

    研究成果: ジャーナルへの寄稿学術誌査読

    2 被引用数 (Scopus)

    抄録

    Interaction between a magnetohydrodynamic∼(MHD) pulse and a charged particle is discussed both numerically and theoretically. Charged particles can be accelerated efficiently in the presence of spatially correlated MHD waves, such as short large amplitude magnetic structures, by successive mirror reflection (Fermi process). In order to understand this process, we study the reflection probability of particles by the MHD pulses, focusing on the adiabaticity on the particle motion. When the particle velocity is small (adiabatic regime), the probability that the particle is reflected by the MHD pulse is essentially determined only by the pitch angle, independent from the velocity. On the other hand, in the non-adiabatic regime, the reflection probability is inversely proportional to the square root of the normalized velocity. We discuss our numerical as well as analytical results of the interaction process with various pulse amplitude, pulse shape, and the pulse winding number. The reflection probability is universally represented as a power law function independent from above pulse properties.

    本文言語英語
    ページ(範囲)265-273
    ページ数9
    ジャーナルNonlinear Processes in Geophysics
    15
    2
    DOI
    出版ステータス出版済み - 2008

    !!!All Science Journal Classification (ASJC) codes

    • 統計物理学および非線形物理学
    • 地球物理学
    • 地球化学および岩石学

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