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

    Research output: Contribution to journalArticle

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    Abstract

    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
    Volume20
    Issue number22
    DOIs
    Publication statusPublished - Jan 1 1993

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    solar wind
    plasma
    wind wave
    plasma waves
    sound waves
    magnetic field
    acoustics
    magnetic fields
    sound

    All Science Journal Classification (ASJC) codes

    • Geophysics
    • Earth and Planetary Sciences(all)

    Cite this

    Evolution of large amplitude Alfvén waves in the solar wind with β∼1. / Hada, Tohru.

    In: Geophysical Research Letters, Vol. 20, No. 22, 01.01.1993, p. 2415-2418.

    Research output: Contribution to journalArticle

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    abstract = "A new set of equations is obtained which describes evolution of finite amplitude, dispersive, elliptically polarized quasi‐parallel Alfv{\'e}n waves, when the plasma and the wave amplitude satisfy the condition, |1‐CS2/CA2| < δB/B0, where CA and Cs are the Alfv{\'e}n and the sound speed, respectively, and δB/B0 is the Alfv{\'e}n 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 Alfv{\'e}n 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 Alfv{\'e}n waves have large amplitude. Modulational instability of a circularly polarized parallel Alfv{\'e}n wave is discussed.",
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