He(2+) in field-aligned beams - ISEE results

Details He(2+) in field-aligned beams - ISEE results He(2+) in field-aligned beams - ISEE results

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..437f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 3, 1992, p. 437-440. Research sponsored by DOE.

Physics

10

Helium Ions, International Sun Earth Explorers, Proton Beams, Shock Waves, Solar Wind, Bow Waves, Ion Beams, Ion Density (Concentration)

Scientific paper

He(2+) concentrations are determined for 14 field-aligned proton-beam events observed in the ion-foreshock region upstream from the earth's bow shock by the ISEE spacecraft. For all 14 events, most under normal solar-wind conditions, the He(2+) concentrations were a factor of 10 or more below the H(+) concentrations in the field-aligned beams when normalized by the solar wind He(2+) to H(+) density ratio. These results indicate that field-aligned beams do not provide the principal He(2+) seed population for ion acceleration in the ion-foreshock region.

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