Phase coherence of foreshock MHD waves: Wavelet analysis

Daiki Koga, Tohru Hada

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)


    The earth's foreshock is a region where particularly large amplitude MHD waves are commonly observed. They exhibit various waveforms, suggesting that nonlinear interaction between the waves is in progress. In a previous paper (Hada et al., 2003) we have introduced a method to quantitatively evaluate the strength of phase coherence among the waves from a given time series data. Here we further develop our method by applying wavelet filtering technique. From the analysis it was found that, although the turbulence is consisted of waves with a wide range of plasma rest frame frequencies, only those frequencies lower than the ion gyrofrequency are responsible for generating the phase coherence.

    Original languageEnglish
    Pages (from-to)495-498
    Number of pages4
    JournalSpace Science Reviews
    Issue number1-2
    Publication statusPublished - 2003

    All Science Journal Classification (ASJC) codes

    • Astronomy and Astrophysics
    • Space and Planetary Science


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