Hybrid simulations of collapse of Alfvénic wave packets

B. Buti, M. Velli, P. C. Liewer, B. E. Goldstein, T. Hada

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    Abstract

    Nonlinear dynamics, of large-amplitude circularly polarized Alfvénic wave packets, is investigated using a one-dimensional hybrid model. Kinetic effects such as finite-Larmor radius and nonlinear Landau damping, which become significant for plasmas with β∼ 1. are appropriately accounted for in these high-resolution hybrid simulations. Spatio-temporal evolution, of the left-hand polarized (LHP) wave packets, shows that they collapse because of the decreasing dispersive effects. However, singularities are arrested by the wave-particle interactions. At some critical time te, which depends on the plasma β and the initial amplitude of the wave packet, we observe a turning point. At this turning point, the polarization changes from LHP to RHP (right-hand polarized). The wave packet then starts broadening due to increasing dispersion associated with the RHP. Implications of collapse of the magnetic structures are briefly discussed.

    Original languageEnglish
    Pages (from-to)3998-4003
    Number of pages6
    JournalPhysics of Plasmas
    Volume7
    Issue number10
    DOIs
    Publication statusPublished - Oct 2000

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    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

    Cite this

    Buti, B., Velli, M., Liewer, P. C., Goldstein, B. E., & Hada, T. (2000). Hybrid simulations of collapse of Alfvénic wave packets. Physics of Plasmas, 7(10), 3998-4003. https://doi.org/10.1063/1.1289890