Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..111p&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, Feb. 1991, p. 111-125.
Physics
5
Atmospheric Physics, Earth Magnetosphere, Field Aligned Currents, Magnetohydrodynamic Flow, Magnetosphere-Ionosphere Coupling, Charge Exchange, Electron Diffusion, Ionic Diffusion, Particle Precipitation, Pressure Gradients, Solar Terrestrial Interactions
Scientific paper
Pressure gradients created by the adiabatic convection of the magnetospheric plasma cannot completely explain the observed distribution at the planetary scale of region 2 field-aligned currents. The contribution of particle loss processes are examined and evaluated to a final approximation. It is shown that the assumption of a strong pitch-angle diffusion for both ions and electrons provides estimates comparable to the observed fluxes of soft precipitations. The efficiency of ion charge exchange was generally found to be weak relative to ion precipitation. Finally, these loss terms are included into a simplified fluid model of magnetospheric transport. The agreement with observations reveals the importance of losses, especially ion losses, in the generation of region 2 field-aligned currents.
Fontaine Dominique
Peymirat Christophe
Senior Catherine
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