What auroral electron and ion beams tell us about magnetosphere-ionosphere coupling

Details What auroral electron and ion beams tell us about magnetosphere-ionosphere coupling What auroral electron and ion beams tell us about magnetosphere-ionosphere coupling

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ssrv...37..313k&link_type=abstract

Space Science Reviews (ISSN 0038-6308), vol. 37, Mar.-Apr. 1984, p. 313-397.

Physics

18

Auroral Zones, Electrostatic Waves, Ionospheric Electron Density, Ionospheric Ion Density, Magnetosphere-Ionosphere Coupling, Magnetospheric Electron Density, Magnetospheric Ion Density, Electron Beams, Ion Beams, Ionospheric Currents, Magnetic Storms, Magnetohydrodynamic Stability, Plasma Drift, Plasma-Particle Interactions

Scientific paper

It is noted that fluid analyses have shown that upgoing ion beams carry a great deal of momentum flux from the ionosphere. This aspect of ion beams is analyzed by considering the entire acceleration region a black box and determining the forces that must be applied to support the upgoing beams. This force could come from electrons of moderate energy (10s of eV) that are heated near the lower border of the acceleration region. Attention is called to the difficulty of using standard particle detectors to measure the particles that carry electric current in much of the magnetosphere. Measurements of this type may be relatively easy within upgoing ion beams since there is some evidence that few of the hard-to-measure cold plasma particles are present. Ion beam regions may therefore be good places for studying fluid or MHD properties of magnetospheric plasmas, including the identification of current carriers, a study of current continuity, and some aspects of the substorm and particle energization processes. A summary is presented of experimental results that would be helpful in analyzing several magnetospheric problems.

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