Atmospheric solar tides and their electrodynamic effects. I - The global Sq current system. II - The equatorial electrojet

Details Atmospheric solar tides and their electrodynamic effects. I - The global Sq current system. II - The equatorial electrojet Atmospheric solar tides and their electrodynamic effects. I - The global Sq current system. II - The equatorial electrojet

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..897f&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 38, Sept.-Oct. 1976, p. 897-920.

Physics

13

Atmospheric Tides, Dynamo Theory, E Region, Electrodynamics, Equatorial Electrojet, Ionospheric Currents, Solar Activity Effects, Atmospheric Models, Diurnal Variations, Finite Difference Theory, Ionospheric Conductivity, Magnetic Variations, Magnetohydrodynamic Flow, Magnetohydrodynamic Stability, Three Dimensional Models

Scientific paper

The purpose of the investigation is to construct a three-dimensional global numerical model of the electrodynamics of solar tides in the E-region of the ionosphere, using wind and conductivity models consistent with recent experimental and theoretical determinations. A new feature of the analysis consists in that a global 'thin shell' dynamo model accounting for vertical structure of the winds is coupled with a full three-dimensional electrojet including winds, vertical current flow, and local time variations. The dynamo action of combined diurnal and semidiurnal winds is found to account for the Sq variations in ground magnetic data without recourse to electric fields of plasmaspheric origin. The basic features of the three-dimensional electrojet structure can be approximated by Richmond's (1973) meridional plane model when coupled to local time variations of the polarization field generated by dynamo action given by the thin-shell approximation. Inclusion of local winds in the electrojet model enables simulation of the double-peaked structures observed near the magnetic equator by rocket-borne magnetometers.

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