Ion acceleration by parallel propagating nonlinear Alfvén wave packets in a radially expanding plasma

Y. Nariyuki, T. Umeda, T. K. Suzuki, T. Hada

    研究成果: ジャーナルへの寄稿学術誌査読

    7 被引用数 (Scopus)

    抄録

    The numerical simulation of the nonlinear evolution of the parallel propagating Alfvén waves in a radially expanding plasma is performed by using a kinetic-fluid model (the Vlasov-MHD model). In our study, both the nonlinear evolution of the Alfvén waves and the radial evolution of the velocity distribution function (VDF) are treated simultaneously. On the other hand, important ion kinetic effects such as ion cyclotron damping and instabilities driven by the non-equilibrium ion velocity distributions are not included in the present model. The results indicate that the steepened Alfvén wave packets outwardly accelerate ions, which can be observed as the beam components in the interplanetary space. The energy of imposed Alfvén waves is converted into the longitudinal fluctuations by the nonlinear steepening and the nonlinear Landau damping. The wave shoaling due to the inhomogeneity of the phase velocity is also observed.

    本文言語英語
    ページ(範囲)339-346
    ページ数8
    ジャーナルNonlinear Processes in Geophysics
    21
    1
    DOI
    出版ステータス出版済み - 2月 27 2014

    !!!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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