Physics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.5775m&link_type=abstract
Journal of Geophysical Research, vol. 86, July 1, 1981, p. 5775-5784. Research supported by the U.S. Defense Nuclear Agency.
Physics
34
F Region, Magnetohydrodynamic Stability, Plasma Clouds, Striation, Computerized Simulation, Electron Diffusion, Equations Of Motion, Plasma Dynamics, Turbulent Diffusion
Scientific paper
The two-dimensional integrated Pedersen conductivity model for F region plasma cloud striation development may be cast in dimensionless form. The result implies that a structure's stability against bifurcation depends upon whether a diffusion parameter R exceeds a critical value. The critical R for striations is determined by high resolution computer simulation for conductivity ratios M from 2 to 30. Our results combined with electron diffusivity of order 1 sq m/s agree with observed minimum scale sizes of 15 m. For turbulent diffusivity of order 100 sq m/s, our results agree with frequent observations of kilometer scale structures which 'freeze up' and last for times of order 10,000 s. This lifetime is also predicted by our results.
McDonald Edward B.
Ossakow S. L.
Zabusky Norman J.
Zalesak S. T.
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