Protons and alpha particles in field-aligned beams upstream of the bow shock

Details Protons and alpha particles in field-aligned beams upstream of the bow shock Protons and alpha particles in field-aligned beams upstream of the bow shock

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15.1153i&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Sept. 1988, p. 1153-1156.

Other

27

Alpha Particles, Bow Waves, Field Aligned Currents, Helium Ions, Hydrogen Ions, Solar Protons, Positive Ions, Proton Beams, Satellite Observation, Solar Wind

Scientific paper

Measurements of H(+) and He(2+) ions in field-aligned beams (about 10 keV/nuc) made with the AMPTE-CCE spacecraft are reported. The proton beam population has a density of less than about 1 percent of the solar wind density and a significant thermal anisotropy, in agreement with previous observations. The observed beam velocities are in reasonable agreement with the 'direct reflection' model, in which a portion of the solar wind is reflected and energized at the earth's bow shock, but are consistently larger than expected from magnetosheath leakage models. The He(2+) ions in the beams have approximately the same velocity as the H(+) ions, but the He(2+) to H(+) density ratio is dramatically smaller than that measured simultaneously in the solar wind. The present beam observations were obtained during several of the time intervals previously analyzed by other workers, using data from the same spacecraft, who attributed the streaming upstream ions to magnetospheric rather than bow shock origin.

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