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Scale Sizes and Lifetimes of F Region Plasma Cloud Striations as Determined by the Condition of Marginal Stability

机译:由边际稳定性条件决定的F区等离子云条带的尺度和寿命

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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 square meter/sec agree with observed minimum scale sizes of 15 meters. For turbulent diffusivity of order 100 square meter/sec, our results agree with frequent observations of kilometer-scale structures which 'freeze up' and last for times of order 10000 seconds. This lifetime is also predicted by our results. (Author)

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