Observations of linear and nonlinear processes in the foreshock wave evolution

Y. Narita, K. H. Glassmeier, M. Fränz, Y. Nariyuki, T. Hada

    研究成果: ジャーナルへの寄稿学術誌査読

    31 被引用数 (Scopus)


    Waves in the foreshock region are studied on the basis of a hypothesis that the linear process first excites the waves and further wave-wave nonlinearities distribute scatter the energy of the primary waves into a number of daughter waves. To examine this wave evolution scenario, the dispersion relations, the wave number spectra of the magnetic field energy, and the dimensionless cross helicity are determined from the observations made by the four Cluster spacecraft. The results confirm that the linear process is the ion/ion right-hand resonant instability, but the wave-wave interactions are not clearly identified. We discuss various reasons why the test for the wave-wave nonlinearities fails, and conclude that the higher order statistics would provide a direct evidence for the wave coupling phenomena.

    ジャーナルNonlinear Processes in Geophysics
    出版ステータス出版済み - 2007

    !!!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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