DE 1 observations of theta aurora plasma source regions and Birkeland current charge carriers

Details DE 1 observations of theta aurora plasma source regions and Birkeland current charge carriers DE 1 observations of theta aurora plasma source regions and Birkeland current charge carriers

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.7503m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, July 1, 1987, p. 7503-7518.

Physics

26

Auroral Arcs, Birkeland Currents, Charge Carriers, Dynamics Explorer 1 Satellite, Magnetospheric Electron Density, Magnetospheric Ion Density, Plasma Currents, Current Sheets, Electron Beams, Field Aligned Currents, Interplanetary Magnetic Fields, Polar Caps

Scientific paper

Detailed analyses of the DE 1 high-altitude plasma instrument electron and ion data have been performed for four passes during which theta auroras were observed. The data indicate that the theta auroras occur on what appear to be closed field lines with particle signatures and plasma parameters that are quite similar to those of the magnetospheric boundary plasma sheet. The field-aligned currents computed from particle fluxes in the energy range 18-13 keV above the theta auroras are observed to be generally downward on the dawnside of the arcs with a narrower region of larger (higher density) upward currents on the duskside of the arcs. These currents are carried predominantly by field-aligned beams of accelerated cold electrons. Of particualr interest in regions of upward field-aligned current are downward electron beams at energies less than the inferred potential drop above the spacecraft.

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