Note on one-fluid modeling of low-frequency Alfvénic fluctuations in a solar wind plasma with multi-ion components

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

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    A simple point of view that non-zero Alfvén ratio (residual energy) appears as a consequence of one-fluid modeling of uni-directional Alfvén waves in a solar wind plasma is presented. Since relative speeds among ions are incorporated into the one-fluid model as a pressure anisotropy, the Alfvén ratio can be finite due to the decrease in the phase velocity. It is shown that a proton beam component typically found in the solar wind plasma can contribute to generating non-zero Alfvén ratio observed in the solar wind plasma. Local equilibrium velocity distribution functions of each ion component are also discussed by using maximum entropy principle.

    Original languageEnglish
    Article number124502
    JournalPhysics of Plasmas
    Issue number12
    Publication statusPublished - Dec 1 2015


    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

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