The nonlocal theory of periodic density drift instabilities

Details The nonlocal theory of periodic density drift instabilities The nonlocal theory of periodic density drift instabilities

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..938b&link_type=abstract

Journal of Geophysical Research, vol. 88, Feb. 1, 1983, p. 938-944. Research sponsored by the U.S. Department of Energy;

Physics

5

Electrostatic Waves, Magnetohydrodynamic Stability, Periodic Variations, Plasma Density, Plasma Drift, Space Plasmas, Fourier Series, Modal Response, Rates (Per Time), Series Expansion

Scientific paper

The nonlocal theory of electrostatic density drift instabilities is developed for an arbitrary, periodic variation in plasma density. Linear Vlasov theory is applied to Fourier series representations of the plasma density, and the resulting equations are solved numerically. The growth rates of the universal drift instability are compared by using local and nonlocal theories. It is demonstrated that the local theory is inadequate if the nonlocal eigenfunctions of the electrostatic modes have significant amplitude over spatial regions wider than the regions of large plasma density gradients. Nonlocal effects can enhance wave-particle diffusion of a triangular-shaped variation and reduce wave-particle dissipation of a square-shaped irregularity.

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