Determination of striation scale sizes for plasma clouds in the ionosphere

Details Determination of striation scale sizes for plasma clouds in the ionosphere Determination of striation scale sizes for plasma clouds in the ionosphere

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3111f&link_type=abstract

Journal of Geophysical Research, vol. 80, Aug. 1, 1975, p. 3111-3120.

Physics

2

Barium Ion Clouds, Earth Ionosphere, Magnetohydrodynamic Stability, Plasma Clouds, Striation, Collision Rates, E Region, Equations Of Motion, F Region, Incompressible Fluids, Linearization, Magnetic Fields, Perturbation Theory, Short Circuits

Scientific paper

Linearized stability analysis of a one-dimensional plasma cloud coupled to a background ionosphere shows that if the ionosphere is relatively incompressible (i.e., is at sufficiently high altitudes relative to the cloud), then ionospheric short-circuiting of the cloud leads to short-wavelength stabilization of the E x B instability responsible for striation development. Short-circuiting reduces the polarization potential of the striations, slowing their ion cross-field negative diffusion and allowing ordinary ion cross-field diffusion to dominate and to suppress the instability at short wavelengths. A maximum in the growth rate is thereby induced at a wavelength which may be identified as the preferred scale size for striations. In contrast, if the ionosphere is relatively compressible, then the ionosphere causes destabilization of the cloud, increasing the growth rate for striations of all wavelengths. The quantitative predictions of the theory compare favorably with observations of striation development in an actual mid-latitude twilight barium release.

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