Relationship between Birkeland current regions, particle precipitation, and electric fields

Details Relationship between Birkeland current regions, particle precipitation, and electric fields Relationship between Birkeland current regions, particle precipitation, and electric fields

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7711d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7711-7720.

Physics

41

Birkeland Currents, Convective Flow, Current Sheets, Earth Magnetosphere, Electric Fields, Particle Precipitation, Dmsp Satellites, Radar Tracking, Solar Wind

Scientific paper

The relationship of the large-scale dayside Birkeland currents to large-scale particle precipitation patterns, currents, and convection is examined using DMSP and Sondrestrom radar observations. It is found that the local time of the mantle currents is not limited to the longitude of the cusp proper, but covers a larger local time extent. The mantle currents flow entirely on open field lines. About half of region 1 currents flow on open field lines, consistent with the assumption that the region 1 currents are generated by the solar wind dynamo and flow within the surface that separates open and closed field lines. More than 80 percent of the Birkeland current boundaries do not correspond to particle precipitation boundaries. Region 2 currents extend beyond the plasma sheet poleward boundary; region 1 currents flow in part on open field lines; mantle currents and mantle particles are not coincident. On most passes when a triple current sheet is observed, the convection reversal is located on closed field lines.

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