DE 1 observations of return current regions in the nightside auroral oval

Details DE 1 observations of return current regions in the nightside auroral oval DE 1 observations of return current regions in the nightside auroral oval

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....9314542m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Dec. 1, 1988, p. 14542-14548.

Physics

13

Auroral Zones, Birkeland Currents, Dynamics Explorer 1 Satellite, Field Aligned Currents, Night Sky, Current Density, Electron Beams, Electron Energy, Electron Precipitation, Particle Acceleration, Space Plasmas

Scientific paper

Data from the DE-1 altitude plasma instrument and magnetometer were used to investigate the Birkeland current patterns in the premidnight auroral region and the charge carriers, as well as their relationships with the hot-plasma populations. As expected, upward currents were found to predominate throughout the body of the boundary plasma sheet (BPS). The charge carriers of the upward and the downward currents were found to be precopitating the auroral electrons and the upward accelerated ionospheric electron beams, respectively, throughout the auroral regions. However, in several cases, inverted-V structures interior to the BPS were observed, which were not associated with any detectable upward Birkeland current. It is suggested that, in these circumstances, localized field-aligned current systems may have closed at altitudes below the typical DE-1 altitudes of 10,000-20,000 km, or that field-aligned potential differences may have developed in regions without significant Birkeland currents.

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