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We show that the modulational instability growth rate of zonal flows is determined directly from the quasilinear wave kinetic equation. We also demonstrate the relation between zonal-flow growth and the cross bispectrum of the high-frequency drift-wave-driven Reynolds stress and the low-frequency plasma potential by explicit calculation. Experimental measurements of the spatiotemporal evolution of the spectrum integrated biocoherence at the L to H transition near the edge shear layer indicate a modification in the nonlinear phase coupling, which might be linked to the generation of sheared E X B flows.

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Authors: DIAMOND PH, University of California, San Diego, La Jola, California (US);ROSENBLUTH MN, University of California, San Diego, La Jola, California (US);SANCHEZ E, EURATOM-CIEMAT, Madrid (ES);HIDALGO C, EURATOM-CIEMAT, Madrid (ES);VAN MILLIGEN B, EURATOM-CIEMAT, Madrid (ES);ESTRADA T, EURATOM-CIEMAT, Madrid (ES);BRANAS B, EURATOM-CIEMAT, Madrid (ES);HIRSCH M, EURATOM/IPP, Garching (DE);HARTFUSS HJ, EURATOM/IPP, Garching (DE);CARRERAS BA, Oak Ridge National Laboratory, Oak Ridge, Tennessee (US)
Bibliographic Reference: Article: Physical Review Letters Vol. 84 (2000) No. 21, pp. 4842-4845
Availability: Physical Review Letters (Journal)
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