H/+/ and He/2+/ in the dawnside magnetosheath

Details H/+/ and He/2+/ in the dawnside magnetosheath H/+/ and He/2+/ in the dawnside magnetosheath

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..667p&link_type=abstract

Geophysical Research Letters, vol. 6, Aug. 1979, p. 667-670. Swiss National Science Foundation

Physics

6

Helium Ions, Hydrogen Ions, Magnetopause, Magnetosheath, Plasma-Particle Interactions, Energetic Particles, Energy Spectra, Ion Temperature, Plasma Sheaths, Solar Wind

Scientific paper

Mass and energy analyses of energetic ions in the dawnside magnetosheath have been made by the energetic ion composition experiment on the ISEE-1 spacecraft over the energy range 10 eV/e to 17 keV/e. The significant observations are: the bulk flows of the H(+) and He(2+) components determined from first moments of the distributions averaged over several minutes are equal within the uncertainties of the measurement. The H(+) and He(2+) distributions are similar in that they both show temperature anisotropies with perpendicular temperature not less than parallel temperature; however, the distributions are not well characterized by temperatures derived from second moments. In at least one case high energy tails of both distributions can be characterized by an additional higher temperature component. The major difference between the H(+) and He(2+) distributions is the depletion of the low velocity (in the center of mass frame) part of the He(2+) distributions, relative to the H(+) distributions.

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