Formation of visco-dissipative vortex and quasi-neutrality breaking in a magnetoplasma

M. Y. Tanaka, K. Nagaoka, A. Okamoto, S. Yoshimura, M. Kono

    Research output: Contribution to journalConference article

    1 Citation (Scopus)


    A monopole vortex with a density cavity in its core has been observed in a cylindrical magnetized plasma. It looks like an eye of a typhoon and is called "plasma hole". Velocity field measurement revealed that there exists a radially converging flow and the vorticity distribution is localized in the central hole region. This vorticity localization is identified as a Burgers vortex, which is intrinsic in viscous fluids and has never been observed in a plasma. The effective viscosity of the hole plasma determined by the characteristic scale length of the vorticity localization exhibits an extremely large value compared with the classical one. Potential measurements also revealed that the degree of non-neutrality is three orders of magnitude higher than that without the plasma hole. This result strongly suggests a correlation between the viscosity anomaly and the quasi-neutrality breaking.

    Original languageEnglish
    Pages (from-to)49-53
    Number of pages5
    JournalPhysica Scripta T
    Publication statusPublished - 2004
    EventInternational Topical Conference on Plasma Physics: Complex Plasmas in the New Millennium - Santorini Island, Greece
    Duration: Sep 8 2003Sep 12 2003

    All Science Journal Classification (ASJC) codes

    • Atomic and Molecular Physics, and Optics
    • Mathematical Physics
    • Condensed Matter Physics

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