Physics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.7504c&link_type=abstract
Journal of Geophysical Research, vol. 87, Sept. 1, 1982, p. 7504-7511.
Physics
46
Auroral Electrojets, Electron Beams, Polar Regions, Space Plasmas, Energy Spectra, Ion Beams, Spatial Distribution
Scientific paper
A statistical survey of the narrow, field-aligned electron beams observed from S3-3 shows that they are a common phenomenon in a region above the polar ionosphere corresponding with the statistical, visible auroral oval, and are closely associated with such upflowing ions as those of the ion conics. The beams have a narrow pitch angle distribution whose median half width at half maximum flux is 6.0 + or 2.5 deg, and their energy spectra are soft and often detectable only below 400 eV. The peak fluxes of the beams reach values in excess of 10 to the 11th/sq cm sr sec keV. The source region of the electron beams was found to be usually situated above 5000 km, and above 8000 km for the case of the downflowing beams. It is suggested that a source model of a region of multiple, short-lived double layers can account for several of the principal features of the beams.
Collin Henry L.
Sharp R. D.
Shelley Edward G.
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