Theory for modeling the equatorial evening ionosphere and the origin of the shear in the horizontal plasma flow

Details Theory for modeling the equatorial evening ionosphere and the origin of the shear in the horizontal plasma flow Theory for modeling the equatorial evening ionosphere and the origin of the shear in the horizontal plasma flow

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1209h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1209-1223.

Physics

81

Equatorial Regions, Ionospheric Heating, Magnetohydrodynamic Flow, Magnetoplasmadynamics, Plasmasphere, E Region, Evening, Ionospheric Ion Density, Magnetohydrodynamic Shear Heating, Models, Shear Flow, Space Plasmas

Scientific paper

Equations describing the time evolution of the equatorial ionosphere are developed using flux-tube-integrated and flux-tube-weighted quantities which model the chemistry, dynamics, and electrodynamics of the equatorial ionosphere. The resulting 2D set can be used to investigate equatorial electric fields, neglecting small-scale phenomena. An immediate result derived from the integrated current equations is an equation describing the physics of the shear in the horizontal flow of the equatorial plasma during the evening hours. The profile of the horizontal flow has three important contributing terms relating to the neutral wind dynamo, Hall conduction, and the equatorial electrojet current divergence. A 1D model of the velocity shear equation and the integrated ionospheric transport equations is used to present a time history of the development of the shear feature during the postsunset hours. The 1D-model results are compared to the velocity shear measurements from the colored bubbles experiments.

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