Propagation velocity of Alfvén wave packets in a dissipative plasma

Yoshimitsu Amagishi, Hiroyuki Nakagawa, Masayoshi Tanaka

    研究成果: ジャーナルへの寄稿学術誌査読

    12 被引用数 (Scopus)


    We have experimentally studied the behavior of Alfvén wave packets in a dissipative plasma due to ion neutral-atom collisions. It is urged that the central frequency of the packet is observed to gradually decrease with traveling distance in the absorption range of frequencies because of a differential damping among the Fourier components, and that the measured average velocity of its peak amplitude is not accounted for by the conventional group velocity, but by the prediction derived by Tanaka, Fujiwara, and Ikegami [Phys. Rev. A 34, 4851 (1986)]. Furthermore, when the initial central frequency is close to the critical frequency in the anomalous dispersion, the wave packet apparently collapses when traveling along the magnetic field; however, we have found that it is decomposed into another two wave packets with the central frequencies being higher or lower than the critical frequency.

    ジャーナルPhysical Review E
    出版ステータス出版済み - 1994

    !!!All Science Journal Classification (ASJC) codes

    • 統計物理学および非線形物理学
    • 統計学および確率
    • 凝縮系物理学


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