Magnetospheric electric fields and currents and their influence on large scale thermospheric circulation and composition

Details Magnetospheric electric fields and currents and their influence on large scale thermospheric circulation and composition Magnetospheric electric fields and currents and their influence on large scale thermospheric circulation and composition

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jatp...41..853v&link_type=abstract

(COSPAR, SCOSTEP, IAU, IUGG, URSI, and IUPAP, International Symposium on Solar-Terrestrial Physics, 5th, Innsbruck, Austria, May

Physics

8

Atmospheric Composition, Atmospheric Electricity, Atmospheric Heating, Earth Magnetosphere, Electric Fields, Resistance Heating, Wind Profiles, Atmospheric Tides, Convective Flow, Heat Transfer, Ionospheric Storms, Momentum Transfer, Temperature Profiles, Wind Effects, Wind Variations

Scientific paper

The magnetospheric electric convection field is a major momentum and heat source which drives atmospheric wind fields. In the present paper, simplified models of momentum force and Joule heating, caused by the convection field, are developed in terms of series of lowest-order spherical harmonics. These source terms drive global wind systems which depend on the latitude, longitude, local time, and universal time. The winds are superposed on tidal winds generated by regular solar radiation. The systems caused by Joule heating are shown to be predominantly solenoidal winds, having relatively strong vertical wind components associated with pressure and temperature variations. The momentum force generates predominantly irrotational winds that are not associated with vertical winds and pressure variations. It is the solenoidal wind that is mainly responsible for the observed changes in composition during geomagnetic activity and the resulting negative ionospheric storm effects.

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