Observations of linear and nonlinear processes in the foreshock wave evolution

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

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    30 Citations (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.

    Original languageEnglish
    Pages (from-to)361-371
    Number of pages11
    JournalNonlinear Processes in Geophysics
    Issue number4
    Publication statusPublished - 2007

    All Science Journal Classification (ASJC) codes

    • Statistical and Nonlinear Physics
    • Geophysics
    • Geochemistry and Petrology


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