On the propagation of auroral electron currents by MHD Alfven waves

Details On the propagation of auroral electron currents by MHD Alfven waves On the propagation of auroral electron currents by MHD Alfven waves

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..417k&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, April 1988, p. 417-421. Research supported by the Toray Science Foundatio

Physics

4

Auroral Zones, Electron Beams, Magnetohydrodynamic Waves, Plasma Currents, Wave Propagation, Earth Magnetosphere, Field Aligned Currents, Solar Wind

Scientific paper

The dilemma of propagating field-aligned currents by the MHD Alfven waves while the current carriers are super-Alfvenic auroral electrons can be reconciled by neutralizing the current running ahead of the Alfven wavefront. The neutralizing currents are generated by the interaction between the electron beam head and the magnetized background plasma. Thus, the auroral electron current is allowed to propagate at the Alfven speed while the electron beam itself propagates at the super-Alfvenic beam speed. Moreover, it is shown that upward field-aligned currents carried by auroral electrons are generated above the auroral acceleration region, while those carried by thermal electrons with energy less than 5 eV are most likely generated below the auroral acceleration region.

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