Closure of field-aligned currents carried by super-Alfvenic auroral electrons

Details Closure of field-aligned currents carried by super-Alfvenic auroral electrons Closure of field-aligned currents carried by super-Alfvenic auroral electrons

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5485n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5485-5489.

Physics

4

Auroral Zones, Electron Beams, Field Aligned Currents, Current Sheets, Electron Density (Concentration), Fourier Transformation, Magnetohydrodynamics

Scientific paper

A linear analysis is carried out to investigate how the return current is generated for the field-aligned current carried by a super-Alfvenic auroral electron beam. If the electron beam is a thin sheet with thickness less than or equal to the electron inertia length, the negative space charge of the beam is neutralized by the ion polarization current produced by the beam. The return current in this case is generated on the two outsides of the beam connected to the polarization current to form a closed current loop. This current structure can explain the thin (a few km) current sheets in the auroral arcs observed by satellites.

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