Nonlinear equatorial spread F - The effect of neutral winds and background Pedersen conductivity

Details Nonlinear equatorial spread F - The effect of neutral winds and background Pedersen conductivity Nonlinear equatorial spread F - The effect of neutral winds and background Pedersen conductivity

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..151z&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 151-166. Research supported by the U.S. Defense Nuclear Agency and U

Physics

167

Equatorial Atmosphere, Ionospheric Conductivity, Ionospheric Electron Density, Space Plasmas, Spread F, Atmospheric Models, Electron Scattering, Ionospheric Disturbances, Mathematical Models, Neutral Currents, Nonlinear Equations, Plasma Dynamics

Scientific paper

A consequence of the model presented for the interaction of the equatorial ionosphere with the eastward F region neutral wind, in the presence of evolving spread F bubbles, is that the upper portion of bubbles will take on a westward tilt while the lower portions tilt eastward. This gives rise to the fishtails and Cs observed by coherent backscatter radar measurements of field-aligned, small-scale irregularities. The plasma away from the equatorial plane makes a finite contribution to the magnetic field line-integrated Pedersen conductivity, causing an incomplete coupling of the plasma motion to the neutral wind. The degree of coupling is, then, a function of the Pedersen conductivities both near the equator in the F region and in the higher-latitude E region, giving rise to vertical shears of east-west plasma motion which have opposite signs on either side of the equatorial Pedersen conductivity maximum.

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