Evolution of large amplitude Alfvén waves in the solar wind with β∼1

Tohru Hada

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    48 Citations (Scopus)


    A new set of equations is obtained which describes evolution of finite amplitude, dispersive, elliptically polarized quasi‐parallel Alfvén waves, when the plasma and the wave amplitude satisfy the condition, |1‐CS2/CA2| < δB/B0, where CA and Cs are the Alfvén and the sound speed, respectively, and δB/B0 is the Alfvén wave amplitude normalized to the background magnetic field. When this condition is satisfied, the sound wave as well as the right‐ and left‐hand polarized Alfvén waves are nearly all degenerated. The solar wind plasma is a typical medium for the obtained set of equations to apply, since the plasma β is high, and the solar wind Alfvén waves have large amplitude. Modulational instability of a circularly polarized parallel Alfvén wave is discussed.

    Original languageEnglish
    Pages (from-to)2415-2418
    Number of pages4
    JournalGeophysical Research Letters
    Issue number22
    Publication statusPublished - Nov 19 1993

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)


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