HR: 0800h
AN: NG21B-0519    [Abstracts]
TI: The role of zonal flows in laboratory and space plasmas¹
AU: * Guzdar, P N
EM: guzdar@umd.edu
AF: Parvez N Guzdar, IREAP, University of Maryland, College Park, MD 20742, United States
AU: Gondarenko, N A
EM: ngondare@umd.edu
AF: Parvez N Guzdar, IREAP, University of Maryland, College Park, MD 20742, United States
AU: Kleva, R G
EM: kleva@umd.edu
AF: Parvez N Guzdar, IREAP, University of Maryland, College Park, MD 20742, United States
AB: Zonal flows are one-dimensional potential flows excited by primary instabilities in plasmas and fluids. They in turn play a significant role in determining the amplitude level of the primary instability. Zonal flows saturate the primary instability by effectively shearing the primary vortices. The basic secondary instability that leads to the excitation of zonal flows is a modulational instability. We will present two examples, a laboratory plasma and high latitude ionospheric plasma where the turbulent structures lead to generation of zonal flows which in turn regulates the level of the flow and the associated level of anomalous particle transport. ¹ Work supported by NSF and DOE
DE: 4445 Nonlinear differential equations
DE: 7831 Laboratory studies and experimental techniques
DE: 7844 Parametric processes
DE: 7863 Turbulence (4490)
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting