Short-circuiting, ion-viscous, and ion-inertial effects in striation 'freezing'

Details Short-circuiting, ion-viscous, and ion-inertial effects in striation 'freezing' Short-circuiting, ion-viscous, and ion-inertial effects in striation 'freezing'

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.8507s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 1, 1985, p. 8507-8524. DNA-supported research.

Physics

5

Barium Ion Clouds, Earth Ionosphere, Magnetohydrodynamic Stability, Short Circuit Currents, Space Plasmas, Striation, Density Distribution, Electric Fields, Inertia, Thermodynamic Equilibrium, Viscosity

Scientific paper

A linear dispersion relation is derived describing the collisional gradient drift instability of a plasma cloud in the ionosphere assuming the partial short-circuiting of perpendicular ambipolar electric fields, ion inertia, and ion viscosity are the major factors contributing to 'freezing' of striations in the geomagnetic field. A quantitative evaluation of the dispersion relation is performed in order to study the localized eigenmodes of low-density portions of the plasma when short-circuiting is active. It is shown that short-circuiting of perpendicular ambipolar electric fields is weak at the sharp perpendicular density gradients where striations begin to form. An expression is obtained for estimating the outer scale wave number for 'frozen' striations, and its application to the U-shaped curve formulation of striation dynamics is discussed.

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