TITLE

Fluctuation spectrum of resistive pressure-gradient-driven turbulence

AUTHOR(S)
Lee, G. S.; Carreras, B. A.; Garcia, L.
PUB. DATE
January 1989
SOURCE
Physics of Fluids B: Plasma Physics;Jan89, Vol. 1 Issue 1, p119
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The spatial structure of resistive pressure-gradient-driven turbulence is studied analytically with renormalized two-point spectrum equations and numerically by multihelicity nonlinear calculations. The wavenumber spectra for the pressure fluctuations and electrostatic potential fluctuations have been calculated with spectral analysis techniques. The least-squares fit of the numerically calculated wavenumber spectrum to a power law yields a pressure fluctuation spectrum m∼m-(2.4±0.4) and an electrostatic potential fluctuation spectrum <[lowercase_phi_synonym]2>m∼m-(4.3±0.3). These results agree with the predictions of the analytic theory. The power-law decay indexes of energylike spectra show the three-dimensionality of resistive pressure-gradient-driven turbulence, even in a plasma with a strong axial magnetic field. This characteristic of resistive fluid turbulence arises from the important role of the resistivity as an integral part of plasma turbulence and differentiates the resistive plasma turbulence from the homogeneous fluid turbulence.
ACCESSION #
9830434

 

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