On the bicoherence analysis of plasma turbulence

K. Itoh, Y. Nagashima, S. I. Itoh, P. H. Diamond, A. Fujisawa, M. Yagi, A. Fukuyama

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Abstract

The bicoherence of fluctuations in a system of drift waves and zonal flows is discussed. In strong drift-wave turbulence, where broadband fluctuations are excited, the bicoherence is examined. A Langevin equation formalism of turbulent interactions allows us to relate the bicoherence coefficient to the projection of nonlinear force onto the test mode. The dependence of the summed bicoherence on the amplitude of zonal flows is clarified. The importance of observing biphase is also stressed. The results provide a basis for measurement of nonlinear interaction in a system of drift waves and zonal flow.

Original languageEnglish
Article number102301
Pages (from-to)1-9
Number of pages9
JournalPhysics of Plasmas
Volume12
Issue number10
DOIs
Publication statusPublished - Nov 11 2005

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Itoh, K., Nagashima, Y., Itoh, S. I., Diamond, P. H., Fujisawa, A., Yagi, M., & Fukuyama, A. (2005). On the bicoherence analysis of plasma turbulence. Physics of Plasmas, 12(10), 1-9. [102301]. https://doi.org/10.1063/1.2062627