In Search of the Elusive Zonal Flow Using Cross-Biocoherence Analysis
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.
Bibliographic Reference: Article: Physical Review Letters Vol. 84 (2000) No. 21, pp. 4842-4845
Availability: Physical Review Letters (Journal)
Record Number: 200012117 / Last updated on: 2000-07-12
Original language: en
Available languages: en