Three-dimensional simulation study of ionospheric plasma clouds

Details Three-dimensional simulation study of ionospheric plasma clouds Three-dimensional simulation study of ionospheric plasma clouds

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1597z&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1597-1600. Research supported by DNA and NASA.

Physics

10

Ionospheric Disturbances, Plasma Clouds, Plasma Dynamics, Three Dimensional Models, Ionospheric Ion Density, Magnetohydrodynamic Stability, Plasma Density, Shear Flow

Scientific paper

The results of fully three-dimensional numerical simulations of ionospheric plasma cloud evolution are presented. The evolution of the plasma cloud considered by Drake and Huba (1987) in the limit of vanishingly small ion compressibility is discussed. Simulations support the results of the analytical theory: finite plasma temperature, combined with fully three-dimensional plasma dynamics, is a stabilizing influence on plasma cloud evolution. This stability is associated with sheared azimuthal ion flows in the vicinity of the cloud surface. Cloud evolution using realistic values of ion compressibility show that the cloud rapidly diffuses to a state in which the sheared azimuthal flow is substantially reduced; subsequently, the cloud becomes unstable and structures.

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