Coherent structures in two-dimensional plasma turbulence

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Physics of Fluids B; (USA)

DOI:https://doi.org/10.1063/1.859680· OSTI ID:5594107

Huld, T; Nielsen, A H; Pecseli, H L; Juul Rasmussen, J ^[1]

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1. Association EURATOM-Riso National Laboratory, Optics and Fluid Dynamics Department, Riso National Laboratory, DK-4000 Roskilde, Denmark (DK)

Low-frequency, flute-type electrostatic fluctuations propagating across a strong, homogeneous magnetic field are studied experimentally. The fluctuations are generated by the Kelvin--Helmholtz instability. The presence of relatively long-lived vortexlike structures in a background of wide-band turbulent fluctuations is demonstrated by a conditional sampling technique. Depending on plasma parameters, the dominant structures can appear as monopole or multipole vortices, dipole vortices in particular. The importance of large structures for the turbulent plasma diffusion is discussed. A statistical analysis of the randomly varying plasma flux is presented.

• OSTI ID: 5594107
• Journal Information: Physics of Fluids B; (USA), Vol. 3:7; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
PLASMA
TURBULENCE
DIFFUSION
ELECTROSTATICS
FLUCTUATIONS
FLUTE INSTABILITY
FREQUENCY DEPENDENCE
HELMHOLTZ INSTABILITY
MAGNETIC FIELDS
STATISTICAL MECHANICS
VORTICES
INSTABILITY
MECHANICS
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
VARIATIONS
640430* - Fluid Physics- Magnetohydrodynamics