Birkeland currents and energetic particles associated with optical auroral signatures of a westward traveling surge

Details Birkeland currents and energetic particles associated with optical auroral signatures of a westward traveling surge Birkeland currents and energetic particles associated with optical auroral signatures of a westward traveling surge

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.8691b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Aug. 1, 1987, p. 8691-8699. USAF-supported research.

Physics

24

Auroras, Birkeland Currents, Energetic Particles, Ionospheric Currents, Space Plasmas, Dmsp Satellites, Kelvin-Helmholtz Instability, Plasma Layers, Plasma-Particle Interactions, Satellite Imagery

Scientific paper

Data acquired by the F7 satellite of the Defense Meteorology Satellite Program during the crossing of a large auroral form that appears to be a westward-traveling surge (WTS) are examined. The discrete arcs surrounding the head of the WTS are found to mark the poleward and equatorward edge of boundary plasma-sheet particles and map to the plasma-sheet boundary layer. The magnetotail equatorial crossing points of field lines that thread these arcs may lie near the distant neutral line downstream from earth. Ions streaming earthward from the plasma-sheet boundary layer provide the energy source for the arcs and the generator of associated Birkeland currents. The WTS results from an expansion of the central plasma sheet into the plasma-sheet boundary layer.

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