Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2356b&link_type=abstract
Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2356-2362. Research sponsored by the U.S. Department of Energy, U.S.
Physics
16
Collisional Plasmas, Ionospheric Drift, Magnetic Disturbances, Magnetic Fields, Particle Diffusion, Plasma-Particle Interactions, Atmospheric Models, Diffusion Coefficient, Energy Dissipation, Wave Interaction
Scientific paper
The nonlinear dissipation of plasma irregularities aligned parallel to an ambient magnetic field is studied numerically using a model which employs both wave-particle and collisional diffusion. A wave-particle diffusion coefficient derived from a local theory of the universal drift instability is used. This coefficient is effective in regions of nonzero plasma gradients and produces triangular-shaped irregularities with spectra which vary as f to the -4th, where f is the spatial frequency. Collisional diffusion acts rapidly on the vertices of the irregularities to reduce their amplitude. The simultaneous action of the two dissipative processes is more efficient than collisions acting alone. In this model, wave-particle diffusion mimics the forward cascade process of wave-wave coupling.
Bernhardt Paul A.
Gray S. P.
Pongratz Morris B.
Thomsen Michelle F.
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