On the bicoherence analysis of plasma turbulence

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

doi:10.1063/1.2062627

On the bicoherence analysis of plasma turbulence

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

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

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 language	English
Article number	102301
Pages (from-to)	1-9
Number of pages	9
Journal	Physics of Plasmas
Volume	12
Issue number	10
DOIs	https://doi.org/10.1063/1.2062627
Publication status	Published - 2005

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.2062627

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title = "On the bicoherence analysis of plasma turbulence",

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.",

author = "K. Itoh and Y. Nagashima and Itoh, {S. I.} and Diamond, {P. H.} and A. Fujisawa and M. Yagi and A. Fukuyama",

note = "Funding Information: This work is partly supported by the Grant-in-Aid for Specially Promoted Research of Ministry of Education, Culture, Sports, Science and Technology, Japan (16002005), by the Grant-in-Aid for Scientific Research (15360495), by the collaboration programs of NIFS and of the Research Institute for Applied Mechanics of Kyushu University, by Asada Science Foundation, and by the U.S. DOE under Grant Nos. FG03-88ER53275 and FG02-04ER54738. One of the authors (P.H.D.) acknowledges the hospitality of Kyushu University. ",

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T1 - On the bicoherence analysis of plasma turbulence

AU - Itoh, K.

AU - Nagashima, Y.

AU - Itoh, S. I.

AU - Diamond, P. H.

AU - Fujisawa, A.

AU - Yagi, M.

AU - Fukuyama, A.

N1 - Funding Information: This work is partly supported by the Grant-in-Aid for Specially Promoted Research of Ministry of Education, Culture, Sports, Science and Technology, Japan (16002005), by the Grant-in-Aid for Scientific Research (15360495), by the collaboration programs of NIFS and of the Research Institute for Applied Mechanics of Kyushu University, by Asada Science Foundation, and by the U.S. DOE under Grant Nos. FG03-88ER53275 and FG02-04ER54738. One of the authors (P.H.D.) acknowledges the hospitality of Kyushu University.

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

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