The spatial distribution of magnetospheric convection electric fields at ionospheric altitudes: a review. II - Theories

Details The spatial distribution of magnetospheric convection electric fields at ionospheric altitudes: a review. II - Theories The spatial distribution of magnetospheric convection electric fields at ionospheric altitudes: a review. II - Theories

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985angeo...3...27b&link_type=abstract

Annales Geophysicae (ISSN 0755-0685), vol. 3, Jan.-Feb. 1985, p. 27-42.

Physics

2

Convection, Earth Magnetosphere, Electric Fields, Ionospheric Currents, Magnetically Trapped Particles, Auroral Zones, Magnetic Field Configurations, Magnetohydrodynamics, Mathematical Models, Ring Currents, Spatial Distribution

Scientific paper

The state of the art in the theory of a plasma convection in the inner magnetosphere is reviewed. The basic equations governing the coupling of ionospheric and magnetospheric plasma motions in response to a dawn-to-dusk potential drop generated externally by the solar-wind/magnetosphere dynamo are presented. The magnetospheric transport equations are written both in the kinetic and in the hydrodynamic description, and the similarity between the two expressions is stressed. The fundamental equation of magnetospheric convection is derived, and simplified analytical solutions showing the spatial and temporal variations of convection electric fields are given. The merits and limits of the linear theory which helps to identify three different convection regimes in the auroral, subauroral, and midlatitude zones are discussed. The results obtained with the use of numerical simulations, which describe ring current build-up and the energy budget of magnetic storms, are summarized.

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