Phase coherence of MHD waves in the solar wind

Tohru Hada, Daiki Koga, Eiko Yamamoto

    Research output: Contribution to journalArticlepeer-review

    50 Citations (Scopus)

    Abstract

    Large amplitude MHD waves are commonly found in the solar wind. Nonlinear interactions between the MHD waves are likely to produce finite correlation among the wave phases. For discussions of various transport processes of energetic particles, it is fundamentally important to determine whether the wave phases are randomly distributed (as assumed in quasi-linear theories) or they have a finite coherence. Using a method based on a surrogate data technique and a fractal analysis, we analyzed Geotail magnetic field data (provided by S. Kokubun and T. Nagai through DARTS at the Institute of Space and Astronautical Science) to evaluate the phase coherence among the MHD waves in the earth's foreshock region. The correlation of wave phases does exist, indicating that the nonlinear interactions between the waves is in progress.

    Original languageEnglish
    Pages (from-to)463-466
    Number of pages4
    JournalSpace Science Reviews
    Volume107
    Issue number1-2
    DOIs
    Publication statusPublished - 2003

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science

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