Ion Cloud Modeling

Linson, Lewis M.; Baxter, David C.

doi:10.21236/ada055969

1977

DOI: 10.21236/ada055969

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Ion Cloud Modeling

Lewis M. Linson¹,

David C. Baxter²

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1979

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“…The atmospheric concentration is assumed to vary ex- The formulation represented by (6) is only valid in lowdensity regions where the released gas will attain a collisionless state before the flow is cominated by diffusion. The regions, which permit collisionless flow, are found by comparing the equal-mass radius of the released gas to the atmospheric mean free path [e.g., Baxter and Linson, 1977;Linson and Baxter, 1977]. The equal-mass radius is the characteristic length of the cloud when it has expanded to a volume which contains an amount of atmospheric mass equal to the mass of the released gas.…”

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confidence: 99%

High‐altitude gas releases: transition from collisionless flow to diffusive flow in a nonuniform atmosphere

Bernhardt¹

1979

J. Geophys. Res.

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Vapors, released at high altitudes from rockets or the Space Shuttle, may travel many hundreds of kilometers before coming to rest. An understanding of the effects produced by these releases requires knowledge of the vapor flow. In the tenuous upper atmosphere, the injected gases expand from a collisionless to a collision‐dominated state. In this paper, this process is described by the Boltzmann equation with the Krook collision integral. The theory is applied to supersonic releases into a nonuniform atmosphere. The model predicts elongation and heating of the vapor trails due to collisions. The theory may be applied to a wide range of experiments whose objectives include the formation of ionospheric depletions, the triggering of instabilities, the generation of gravity waves, and the injection of neutrals as luminous tracers.

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High‐altitude gas releases: transition from collisionless flow to diffusive flow in a nonuniform atmosphere

Bernhardt¹

1979

J. Geophys. Res.

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Scale sizes and lifetimes of F region plasma cloud striations as determined by the condition of marginal stability

McDonald¹,

Ossakow²,

Zalesak³

et al. 1981

J. Geophys. Res.

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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 m²/s agree with observed minimum scale sizes of 15 m. For turbulent diffusivity of order 100 m²/s, our results agree with frequent observations of kilometer scale structures which ‘freeze up’ and last for times of order 104 s. This lifetime is also predicted by our results.

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Ion Cloud Modeling

Cited by 2 publications

References 0 publications

High‐altitude gas releases: transition from collisionless flow to diffusive flow in a nonuniform atmosphere

High‐altitude gas releases: transition from collisionless flow to diffusive flow in a nonuniform atmosphere

Scale sizes and lifetimes of F region plasma cloud striations as determined by the condition of marginal stability

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