Physics – Plasma Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985esasp.235..107f&link_type=abstract
In ESA Future Missions in Solar, Heliospheric and Space Plasma Physics p 107-133 (SEE N86-27330 18-12)
Physics
Plasma Physics
3
Birkeland Currents, Coupling, Earth Ionosphere, Earth Magnetosphere, Magnetic Fields, Magnetosphere-Ionosphere Coupling, Electric Fields, Magnetohydrodynamic Waves, Plasma Acceleration, Plasma Currents, Space Plasmas
Scientific paper
Magnetosphere-ionosphere coupling, and the role of Birkeland currents, magnetic field aligned electric fields, and Alfven waves are discussed. In addition to transporting energy and momentum between the magnetosphere and the ionosphere, the Birkeland current cause a redistribution of matter within and between these regions. They do so directly via exchange of charge carriers, and indirectly via instabilities and acceleration processes that they excite in the plasmas. The spatial distribution of magnetic field aligned electric fields, and the way they are supported are unclear. Changes in electric fields and plasma convection are communicated between the magnetosphere and the ionsophere by Alfven waves. Observations of high power low frequency noise, which fits an Alfven wave discription, and which has a net downward Poynting flux of 100 million W integrated over the auroral regions are reported. Individual Alfven waves, upward and downward propagating, are observed. Oblique Alfven waves are a key feature of a model for auroral arc formation.
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